I was super excited to get the vac. It was working great for about a week. Loved to watch it do it's thing. Methodical and did a thorough job. Then it started getting glitches. It would get lost. Then it would just do a couple passes in a room and say it was done, go home and require a full reboot. Doing a reboot wiped all its memory. So, I had to start all over with mapping. But it didn't matter. Called support. They were good. Did some diagnostic stuff and let me know that the robot would be getting replaced. I still give this 3 stars because I think the robot had done a great job and service was good too. Hope the replacement functions for years to come like my old 805 series did.