I'm still in the cynic camp for a few reasons. 1. My flat is small. I can do a decent vac in about 15 minutes. 30 minutes if I do under the bed. 2. When I do the "big vac", I have to move 6 dining room chairs. Then shift the table a few inches. Zoom. Shift if back. Same goes for some other legged furniture. 3. I also do the windowsills. No bot can do this. 4. Don't you end up with little arched dust patterns in every…
The only thing I hate is that it gets stuff trapped in there so easily. It is meant to have some sort of anti-cord-catching technology, but unless I am very careful I will find it eating a charger or a cat toy or something. It also takes longer than my handheld vacuum, but I don't mind that - often I just quickly pick things up before I run out to the store and let it run as I leave, and then come home to a vacuumed apartment.
My cats also prefer the Roomba even though the noise is comparable. They hide from the Dyson, but couldn't give a crap about the robot running around.