I have a Griffen Vulcan TT bike. On the whole I like it. It's very stiff, which is good and bad in that its not the most comfortable bike to ride.
IMHO, I think the metal matrix frame material is an idea who's time has passed. For $3,675, (the current retail) you can get an awfully nice CF frame that will be lighter, more aero, and more comfortable to ride. (for example a Cervelo P3.)
I got my frame used in excellent condition for $650. At that price, I'm very happy. However I would not even consider paying anything close to retail.