This style has a couple of attractive features. One is the low friction of Mag lev as opposed to bearings which wear quickly, and the sail design is perfectly suited to be placed in the meeting of roof segments at the top of valleys to focus the wind towards the sails, thereby increasing power production. It also produces electricity at lower than usual rotation speeds, improving longevity.
Here's a brief Video of Jay Leno talking about the one he's getting:
http://www.huffingtonpost.com/2009/0..._n_156192.html
And this is the company's site. Links to the brief videos are on this page
http://enviro-energies.com/cart/inde...page=page&id=9