Ok, what IS IT about Dysons? We have one at work (DC07?) and frankly, it sucks. And I don't mean that in a good way. It's quite awkward, it's full of leaky joints, and the root cyclone thing is blah - a cyclonic vacuum, big deal. The beater bar cant' be pulled easy, I don't want to know WHAT you do if the belt breaks, and I doubt it'll work on shag.
Then again, the Oreck dealer admitted their can't withstand shag either.
It's amazing the amount of snake oil and one upsmanship the vacuum industry as a whole's engaged in over the last few years...