Ours at one point got trapped in a maze of two dining room chairs placed next to each other. After about five minutes of watching it bounce around the same five square feet we took pitty on it and moved the chairs. I'm sure it would have found an exit trajectory eventually, but I'm not sure when.

Our floors are certainly a lot more clean with the roomba. It's a horrible vacuum, but it's so much better than having to vacuum yourself.

Matthew