In my experience using a Roomba represents a cache-22 that renders it useless.

1. It is very loud and annoying, and takes a longer time to vacuum than a normal vacuum because of its random “bounce around” approach to cleaning. Therefore, I do not want to be home when it runs.
2. Roomba gets stuck on lots of random things - rumpled carpet, a stray sock, a door jamb. Therefore, I need to be home when it runs to fix it.

Due to this contradiction, I sold my Roomba and will never buy another one.