Yeah. It seems to be easy for them to get under there and much harder for them to get out. Then again, maybe they're doing their "dirt detection" thing. I know the carpet under my couch hasn't been vacuumed in ages.

My only problem is that it has trouble getting on top of some of my rugs. In one case, the short edges of the rug curl up a little. I can probably figure out how to tack them down. In the other case, it's an oriental rug whose pile is a little too thick for it and it always bounces off. I really need to figure out a solution for that.