my friend got one a few weeks ago; it looks totally awesome. he still says that it is terrifying to ride it. I hopped on once and I have to agree. Skidding it just a ton harder and there's pretty much only the one super-aero position.
If you're looking for a hot ride to get on a few times a wekk, i'd say go for it. If you want it as a commuter or a real practical ride, look elsewhere.
ps- is there a specific frame you are looking at??