Summary: I now have 4 of these and none of them work (trying to use it with a Roomba 880). Tried everything including the different advises from iRobot team and no solution yet. So as soon as you get yours, definitely test it out asap, as I just somehow managed to get 4 faulty pieces and am not going to buy...
Summary: I call this thing "drunk uncle" it bumps into everything, get's stuck under anything with a 6" gap under it, and has marked up the walls and all our furniture when it bumps into things (very hard mind you).
Summary: I've tried to get these things to work, but with my layout, they don't. I've read all of the blogs and instructions and have seen the video as well. I've even tried resetting all of them by taking out the batteries. It's a nice concept if it works.
Summary: these do not work well with the roomba when used in lighthouse mode; wall mode works fine. The interaction between the roomba and the lighthouse units result in the roomba often getting stuck in a room, getting lost, etc.
Summary: It kind of works, but I learned to hate it after a few months. It depends upon a rotating brush and soft rubber flaps to pick stuff up, not suction like a regular vacuum. There's a tiny bit of suction from a small motor, but nothing close to even a dust buster.
Summary: This iRoomba 780 series has a MAJOR design flaw! It is NOT designed to pick up pet hair! We have two rescue dogs, and our floors need cleaning daily. This Roomba lasted 3 weeks before it had to be replaced. The problem is when the hair gets trapped around the axle shaft and it causes it to fail!
Summary: These brushes do NOT fit the 770 series Roomba!!! I sent an email to try to return and get correct brushes. Update on this review: The seller emailed me and said to use a little force when putting on the new brush. I did and it worked just fine!