Robot vacuum comparisons open with a suction figure and usually end there. Pascals are easy to print on a
box and easy to rank, so every review site leads with them. Spend a month living with one of these machines
and the number turns out to explain almost none of your satisfaction.
Four other things do. Whether you still rinse mop pads by hand. Whether the dock fits the spot you have for
it. What the machine keeps costing you in bags and pads after the first year. How often it strands itself
on a charging cable. None of that appears on a spec sheet, and all of it is folded into the five axes
averaged here.
First place without winning a single axis
The Q Revo does not lead this page on cleaning, on durability, or on quietness. It finishes first anyway,
because a plain average rewards the machine with no weak axis. It shares the top value score on this page
with the Shark, and unlike the Shark it spends none of that on a mop you work by hand — the washing dock is
the one flagship feature owners consistently name as the reason the category is worth anything.
The Narwal sits a hundredth of a point behind it and arrives the same way: strong everywhere, poor nowhere.
When two machines separate by that little, the average has stopped discriminating and you should choose on
whatever concretely differs. Here that is the dust path. The Narwal keeps debris in a bag inside the robot,
so its station has nothing to empty and never fires the burst that every other base on this page fires.
Why the strongest cleaner finishes third
The S8 MaxV Ultra scores highest on performance and highest on ease of use, and still lands third. Value is
one of five axes, it scores 6.5 there, and only the Roomba scores lower among these six.
That is not a criticism disguised as arithmetic. It is the arithmetic. Averaging five axes without
weighting means a machine cannot buy its way to the top on two of them, and the pattern repeats one place
below: the X40 Ultra posts the second-highest performance score on the page and gives it back on durability,
where a mail-in return to the manufacturer is the service story.
What the dock takes off your hands, and what it does not
Four of these six wash and dry the mop pads. Without that, robot mopping means wringing out dirty pads two
or three times a week, and that chore is where most owners stop using the mop function.
The two at the bottom of the list handle it differently, and the difference is worth understanding before
you buy either. The Roomba’s base does not wash the pad at all — it empties the bin and refills the robot’s
water tank, covering the two chores that make scheduled mopping survive, and leaves the pad itself as a
weekly hand job. The Shark automates none of the mopping: the pad clips on by hand, the water goes in a tank
on the robot, and the pad has to come off again before the machine goes near carpet. Owner reports there
follow a predictable arc into using it as a very good vacuum and nothing else.
The last two places are earned after the first year
Neither of the last two arrives here on one strong axis. The Roomba’s retracting arm and rubber rollers put
it level with the Narwal on cleaning, and then the lowest value score on the page pulls it straight back
down. The Shark is mid-pack at cleaning and pays its way with a base that consumes no bags at all, which is
exactly the kind of running cost the value axis exists to catch.
What they have in common is everything that happens after the first year: parts on ordinary retail shelves,
warranty claims handled domestically, and no export form standing between a broken machine and a working
one. That sits in the durability and value axes, and across five years of ownership it moves an average
further than a suction figure does.
They are also the two loudest machines here, and that is not a coincidence — an emptying base is the noise,
and the Shark’s bagless bin and the Roomba’s hard emptying blast are both worse than the docks above them.
If the base has to live within earshot of a bedroom, that constraint outranks everything on this page, and
the noise-only ranking reorders the same catalogue around it. Two of the
six here survive that sort. The other four do not.
Runtime and app quality, and where they went
Battery runtime is missing from these axes by decision. Every machine here returns to its dock, recharges,
and resumes where it left off. Runtime decides how long a clean takes, not whether it finishes, so it
belongs in the specs table instead of a score.
App quality folds into ease of use rather than standing alone. Firmware updates keep moving it, and a score
of its own would go stale faster than the page.
Questions people ask
- Do I need a robot vacuum with a self-washing mop dock?
- Only if you intend to use the mop at all. Four of the six machines here wash and dry the pads for you; the other two leave that as a job at the sink every week or so, and owner reports are consistent that a hand-rinsed pad is the first feature people quietly abandon. If you have already decided you will mop by hand, buy for suction and support instead, and treat whatever mopping the machine does as a bonus rather than a reason to choose it.
- Will a robot vacuum handle thick carpet?
- Partly, and the mechanism matters more than the suction figure. Spinning-pad machines lift their pads a centimetre or so for carpet, which covers a low-pile rug and not much more. The Roomba's arm folds the pad onto the roof of the robot instead, so a room with a rug in the middle of it gets done in one pass with nothing damp touching it. On deep pile with pet hair worked in, reviewer consensus still puts every robot behind an upright rather than in place of one.
- How much space does the dock actually need?
- More than the product photos suggest. The all-in-one docks that wash and dry pads want roughly 45cm of width plus clearance in front for the robot to align itself, and the self-emptying bases are tall rather than wide. Between them that rules out most of the gaps people plan to use — beside a doorway, between laundry machines, under a console table. Measuring the spot before ordering is the single most useful thing you can do.
- What does a robot vacuum keep costing after the first year?
- Bags, filters, brushrolls, and mop pads, on a schedule the manufacturer sets rather than you. Most self-emptying bases consume a proprietary bag every month or two for as long as you own the machine; the Shark's base is bagless and gets tipped into the bin instead. Batteries and brushrolls are the parts that eventually end a machine, and that is exactly when the difference between domestic warranty handling and a mail-in return to an importer stops being theoretical.
- Is a bagless self-emptying base better than a bagged one?
- It depends which annoyance you would rather live with. A bagged base seals the dust away and you never meet it again, at the cost of a consumable you keep reordering. A bagless base costs nothing to run and puts you briefly in the same air as the dust every time you empty it, which matters if anyone in the house reacts to it. Neither is quieter than the other, because both use the same kind of motor to move the debris.