Well, I don’t know if it qualifies as experiance but I was able to see one in a case-study I did.
They are smart, crafty little things that do an ok job of vacumming. The model I saw (3 or 4 years ago now) was pretty quiet. I would say it’d be good if you had a large living room/bedrooms and wanted to get vacuumning done while a tot was sleeping. We didn’t have any deep shag, so I don’t know how well it did on that…though from its size/weight I really can’t see it being all that wonderful. Again, if you have a big room with low carpet hight it will probably save you a good deal of time.
You do have to “teach” it the room.
What I was really impressed with was the scooba. It was AMAZING. It cleaned mutiple types of floors really well (we even tried it on a poured concrete deck). If I had money and hard floors I’d probably get one. Mopping is a much greater pain in the neck than vacuuming.