The Dyson is a good performer, but not the best example of quality. As far as modern plastics are concerned, the Dyson is one of the leaders in modern durable plastics, but will the Dyson be around to clean in 40,50,60,70 years? Unlikely. If it hasn't broken after the warranty period, you've updated to the latest model. Your opinion can change, you've only had the Dyson for a month, in 5 years will you still be satisfied with your purchase? Will the Dyson still be in one piece in 10,20 years?
Compared to the modern range of bagless, Dyson is leading the market in performance.in my opinion, There is only two bagless vacuums that can excel the latest Dyson models in cleaning, and those two are Fantom and Amway. Honestly, if I had to pick a modern bagless to use,I would choose Dyson. While it does out perform other models, the $700 price tag is ridiculous. The thing is, though, people will pay this price just to one-up their friends. You could buy multiple better bagged vacuums that would out last Dyson for that price, but the market is only concerned with bagless. Bags have become a forgotten art, despite their superiority to bagless, but this is not the place to rant on the matter.
Parwaz- I'm not sure about Britain, but in America the beds have about 5 inches of clearance between them and the floor. Even the mighty Kirby could not clear that gap. However, the Dyson has trouble under tables, chairs and etc. It's easy to scratch your furniture with the Dyson (and I'm not hating on Dyson, many bagless cleaners have this problem). The problem is bulk, and lots of it. I can imagine the ball technology could make furniture damage an easy accident.
Oh and Marcusprit, the Bel Air was one of Chevrolet's biggest successes, and you don't see many people knocking those!