Quote:
Originally Posted by just_lily 
Do the work against the walls? Most of the dog hair in my house collects against the wall and I am just worried that a round Roomba wouldn't pick it up against the straight wall.
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Yes. The Roomba performs in three basic patterns, but mixes them up randomly and gets the job done. It starts out going in an ever-widening circle, usually until it bumps into something (but not always). It also employs "wall-hugging" techniques. Then there is the "random" mode where it bounces illogically all over the place.

The Roomba has this little "brush arm" that swirls around partially under the Roomba and partially out from the round body. It basically grabs / sweeps debris from corners and edges underneath the Roomba to be sucked up.
It also has a rotary brush underneath like an ordinary vacuum, but something about the Roomba is different as it doesn't ruin hardwood or cork floors. The salesgirl at Lowes (where we purchased our cork flooring) explained that it is the heavy weight of most vacuums (specifically the ones with tiny wheels) that ruin hardwood and cork floors, not the brushes. I don't know the specifics. I just know our floors look great and the Roomba gets the credit.

The very tip of any 90 degree angle "inside" corner (very small area, half-inch or less) does not get perfectly clean. If there is actual debris, I either use a broom in the corners before running the Roomba or I mop with my rectangular flathead mop afterwards to take care of that issue. It is rare, except under a few specific circumstances. 1) When we first installed the cork flooring downstairs, all the sawing created a LOT of dust even though we wiped off the planks before bringing them inside. It was insane how much dust was around. 2) In the powder room where we keep the litter box, the pine-type litter gets into two corners if I don't run the Roomba in there a couple times a week. Drifts of cat hair, however, get swept under the Roomba by that little brush arm. 3) When DH accidentally dropped a cup of flour on the kitchen floor, the Roomba got up 99% of it in a normal kitchen cleaning. The corner where the flour was split required a bit more effort since it was light brown (whole wheat) and our cork is natural walnut/natural cherry color.
It is definitely a round peg trying to clean a square hole, but the sweeping brush arm and the wall-hugging and circling patterns overcome a vast majority of those issues. I wouldn't trade my Roomba for any other vacuum for our cork floors, which are exceedingly similar to engineered hardwood in care/maintenance/installation respects. I am rather picky about clean floors, too. I dislike any grit whatsoever under my bare feet and cannot stand pet hair drifts anywhere. I don't have to mop very often with the Roomba doing its vacuuming job.
