I have 2 roomba 960's.
One upstairs, one downstairs. They run everyday. They are great, except I have 2 huskies and if I dont empty them everyday they wont run the next. The bins are pretty small. That's my only "complaint"
If I had the dump station for downstairs it would really be awesome. The upstairs I can get 2-3 days from a bin. But the unit with the dump is about the same price as a pair of rev 10's