I do not have one, but I did help somebody at the side of the road that had one about a year ago (demo-ing from the local Specialized boutique). My initial impression (apart from the negative of having to do adjustments etc for this hapless individual) is it would be a great bike if it were half as expensive. I could buy an extremely well-made titanium custom bike with very high-grade wheels for the same price. (It might be a wee bit heavier, but as a late-middle age lardbag, I can safely say the bike ain't what holds me back.)

If the money is burning a hole in your wallet, go custom, and get exactly what you want.