3-in-1 Robot Vacuum Cleaner S30b Review: a cheap little bot that keeps floors under control (if you’re not too picky)

I’ve been using this generic 3‑in‑1 robot vacuum (model S30b) for a few weeks in a small apartment: mix of tile, laminate and one low‑pile rug, plus a shedding cat. I wasn’t expecting much from an unknown brand, especially at this kind of price and with all the usual promises: strong suction, mopping, smart obstacle avoidance, pet‑friendly, etc. Usually that kind of description means “basic robot with a long Amazon title”.

In day‑to‑day use though, it turned out better than I thought, but with clear limits. It’s not on the same level as a Roomba or Roborock with fancy mapping and app control. There’s no polished ecosystem behind it. It’s a small, button‑controlled robot that just goes out, bumps less than average, and picks up a fair amount of dust and hair. That’s basically what it does, and it stays in that lane.

I used it mostly in the evenings, setting it off while I cooked or watched TV. I let it run in full auto on hard floors, then tried the mop function, then the sweep‑only mode to see how it handled my slightly rough old wood planks. I also tested how often I had to empty the dustbin and clean the brush with a cat that seems to lose half its fur every week.

Overall, my feeling is: it’s a pretty solid low‑cost helper if you just want less visible dirt and fur without thinking too much. But it’s not magic and it’s not super smart. If you expect laser mapping, detailed app zones, or deep carpet cleaning, this is not it. If you want a simple floor‑maintenance robot for mostly hard floors, then it actually makes sense.

Given the unknown brand and the “Generic” label, I went in with low expectations. In that context, the value for money is actually decent. You get a compact robot that vacuums hard floors well, manages pet hair reasonably, has a usable mop function, and doesn’t drive you crazy with constant tangles or impossible maintenance. For someone who just wants less dust and hair and doesn’t care about apps or maps, it’s a pretty fair deal.

Where it loses points is on features compared to big brands. There’s no app, no saved maps, no room zoning, no virtual walls, no voice assistant integration. If you’re used to a higher‑end robot, this will feel very basic. Also, the unknown brand means there’s some risk on long‑term support: replacement parts, warranty handling, and firmware updates are all question marks. You’re basically betting on generic parts being available, which is usually the case, but not guaranteed.

Compared to cheaper no‑name robots I’ve tried, this one is a step up mainly because of the better obstacle behavior (less dumb crashing) and the easier brush maintenance. Those two things alone can be the difference between a robot you actually use regularly and one that ends up in a closet. It also does a bit better at not scattering light debris, which is nice if you have a lot of hair and lint.

If you’re on a budget, live in a small to medium place with mostly hard floors, and don’t care about smart features, the value is pretty solid. If you want something more polished, with proper mapping and strong carpet performance, it’s probably worth saving up for a better‑known brand and paying more. This one sits in that “good enough if your expectations are realistic” category.

The first thing I noticed is the size: 28 x 28 cm and only 5 cm high. That’s really low compared to a lot of robots I’ve tried. The low profile isn’t just a spec; it actually slides under my sofa and under a low TV bench where other vacuums got stuck. That alone helped a lot with dust bunnies, because those are usually the zones I ignore with a normal vacuum unless I move furniture.

The look is basic: white plastic shell, pretty anonymous, no fancy finishes. If you’re into design objects, this is not going to impress you. But the plastic doesn’t feel too flimsy either. I bumped it into chair legs and the base of a metal bed frame quite a few times; no cracks, just the usual scuffs. The top buttons are simple and easy to hit. There’s no fragile flip‑up tower or LiDAR dome, so less to break. It feels like a straightforward, compact puck.

On the underside, you have the main roller brush, side brush, and the mop attachment area. The nice part is this: the main brush assembly pops out with one latch, just like that Amazon review said. No screwdriver, no weird clips. Hair collects mostly at the plastic ends, and it really does slide off pretty easily. This sounds like a small thing, but if you have pets, it’s the difference between you actually maintaining the robot or letting it clog up and die.

One limitation: because it’s so small and light, it doesn’t climb thick thresholds or high-pile rugs very well. It handled my low rug, but struggled a bit on a slightly raised bathroom threshold; sometimes it just gave up and turned around. So the design is great for low furniture and small apartments, but if your home has lots of thick carpets or big transitions between rooms, you’ll notice its limits. Overall, I’d say the design is functional, compact, and easy to live with, but clearly built to a budget.

The robot uses a lithium‑ion battery (included), which is standard now. There’s no flashy spec in the listing about runtime, but in my use, I consistently got around 70–90 minutes on mixed floors before it headed back to recharge. That’s with a mix of hard floor and a bit of carpet, mostly in auto mode with occasional carpet boost. For my 50 m² apartment, that was enough to cover the living room, hallway, and bedroom in one go.

Noise level is moderate. It’s not whisper‑quiet, but it’s not a jet engine either. I could still watch TV with the volume up a bit. In sweep‑only mode with the vacuum motor off, it’s obviously much quieter—just the motor for movement and the brush noise. That’s actually quite nice in the evening if you don’t want to annoy neighbors or if you have kids sleeping.

Charging is straightforward: it docks itself when low. It doesn’t always find the dock on the first try; sometimes it wanders a bit before lining up correctly, but it usually gets there. Full recharge takes a few hours (I just left it overnight). There’s no fancy fast‑charge, but for this kind of product, that’s not a big issue. You’re not vacuuming three times a day with it.

For a small or medium apartment, the battery is basically fine. If you’re in a big house with multiple large rooms and a lot of obstacles, it’ll either need multiple runs or you’ll need to move it and restart it. I’d say the battery is good enough but not impressive. It matches the overall product: practical for regular light cleaning, not built for marathon sessions in a big multi‑floor home.

On hard floors, it actually does a pretty good job for everyday dirt. Crumbs, dust, cat hair, small bits of litter near the box—it picks those up reliably. One thing I liked: the suction seems to kick in before the spinning brush hits a dust pile, like one of the reviews mentioned. That means it doesn’t blow light stuff (feathers, lint, hair clumps) all over the place. I tested it by sprinkling some light lint and small paper bits: most of it got sucked in without flying around, which is better than some cheap robots I’ve used that just push dirt around.

On carpets, it’s more modest. It can handle a low‑pile rug and will pull up surface hair and crumbs, especially when it detects the carpet and boosts suction a bit. But it doesn’t dig deep like bigger, more powerful robots with stronger main brushes. If your place is mostly carpet, this wouldn’t be my first choice. It’s more of a hard‑floor machine that can tolerate a few rugs rather than a carpet specialist.

The sweep‑only mode is surprisingly useful. On my older wood planks with some raised grain and a couple of slightly loose edges, normal suction sometimes makes noise and feels a bit risky. With the vacuum motor off and only the side brush turning, it just collects dust and hair gently. It won’t replace a full vacuum session, but it’s good for quick passes when you don’t want a lot of noise and don’t need deep cleaning.

Coverage-wise, since there’s no advanced mapping, it uses a mix of random-ish patterns and edge following. It eventually covers most of the accessible area in my 50 m² apartment in a run, but not as efficiently as high-end robots. You sometimes see it redoing the same zone and ignoring a corner for a while. So performance is fine for maintenance cleaning, but if you’re picky about spotless corners and strict, methodical lines, you’ll feel the difference compared to pricier brands.

On paper, the S30b is a 3‑in‑1 robot: it can vacuum, sweep with side brushes, and do a simple mop pass with a water tank and cloth pad. There’s no app control here; it’s button control only on the top of the robot. You press, it starts, you press again, it stops. That’s both a plus and a minus: very simple, but no scheduling or fancy customization. It’s clearly aimed at people who don’t care about phone integration and just want to press a button and let it roam.

The brand claims “smart obstacle avoidance” and “advanced chip technology”. In reality, it behaves like a typical low‑mid range bot: it has sensors to avoid big drops and to slow down before bumping stuff, but it still nudges chair legs and baseboards. The difference is that it doesn’t slam into things at full speed all the time; it often slows down first, which is better than the really cheap ones. It also has automatic carpet detection, which I saw mainly as a slight suction increase and a bit more noise when it rolled onto my rug.

The user reviews mention some interesting modes that actually check out: there’s a sweep‑only mode where the vacuum motor turns off but the side brush still spins. That’s handy if you have fragile or uneven wood floors where suction can lift edges or stress loose boards. I used that on my old hardwood: it picked up surface dust without the feeling that it was trying to eat the floor. There’s also a nice detail: the main brush is tool‑free to remove, with a single latch. That really does make maintenance easier; cleaning hair off took me under a minute every couple of weeks.

So in practice, don’t expect a high‑tech robot. Think of it as: small round vacuum, a couple of modes, does basic navigation, vacuums and can drag a wet cloth behind it. It focuses more on keeping things under control than doing a deep, systematic clean. If that’s what you’re looking for, the feature set is actually coherent for the price.

I mainly judged this robot on three things: pet hair handling, how it behaves around edges and corners, and whether the mop function is anything more than a gimmick. With one cat that sheds constantly, the pet angle is important. The brand claims a “tangle free design”, and while that’s a bit optimistic, it’s true that the brush is easier to deal with than on some other robots. Hair does wrap around, but because the ends are smooth plastic, it really does slide off without fighting it. I was cleaning it about every two weeks with my level of shedding, and it took around 30 seconds each time.

For pet hair on hard floors, it does a solid job. Hair, dander, and random litter pieces around the box were gone after a run, except for a few bits hiding behind doors or in tight corners. Around edges, it’s okay but not perfect. The side brush helps pull stuff in, but like most round robots, it’s not a corner specialist. You’ll still want to manually hit corners once in a while if you’re picky, but the general floor surface looks much better day‑to‑day.

Now, the mop function: it’s basically a small water tank with an electronically controlled release and a cloth pad. It’s more of a damp wipe than a proper mop. It’s fine for picking up light dust and footprints, especially on tile, and it leaves the floor looking cleaner, but it won’t handle dried spills, sticky spots, or anything that needs scrubbing. I used it after vacuuming, and the pad came back grey, so it’s doing something, just don’t expect miracles. You still need a real mop for serious messes.

Overall, in everyday life, the robot keeps the visible mess under control: less hair tumbleweeds, fewer crumbs, and floors that look reasonably clean without effort. It’s not perfect, and if you zoom in, you’ll find things it missed. But if your goal is to reduce how often you pull out a regular vacuum and mop, it does that job pretty well for a budget, no‑name model.