We love our shark rotator professional lift away. It picks up a ton of stuff and is light (compared to our old dyson).
However, I just broke down and bought a roomba. Between a dog who is aggressive with the vacuum cleaner and a baby who goes to sleep at 7/7:30, I find it hard to find the time to actually use our shark.
Shark navigator professional. Works as well or better than dyson for 1/3 the price.
Ditto. Our Dyson crapped out after only a few years, and it wasn't that great to begin with IMHO. I replaced it with a Shark, which has been great, for 1/3 price of a Dyson.
ETA: we use a Neato for everyday cleaning, works great. We use the Shark for upholstery and crevices the Roomba misses, like around the dog crate.