A good vacuum marketed as the greatest vacuum ever isn't really that bad. The Dyson bladeless fan[2], however, appears to be just a big gimmick and kind of a shitty fan.
1: www.amazon.com/Dyson-DC25-All-Floors-Upright-Cleaner/dp/B0014E3GM0/
2: http://www.amazon.com/Dyson-Multiplier-Table-10-Inches/dp/B0...
Don't get me wrong, both companies are very impressing and they make their customers happy, but usually they don't have the best hardware of their industry.
I've had mine for over 6 years now, so perhaps there's been a quality shift in the interim, but I've had nothing but good experience from mine.
Offtopic, while I haven't given it thought before now enough to consider myself a fanboy, I also quite like their bladeless fans and the hand dryers I've seen in rest stops.