Old thread I know, just had to club in.
I have three Vitus bikes 2 x 979 and one 992.
The 992 is built up with Dura Ace 7700 and by today's standards at 20lbs probably a bit heavy, however it remains one of my favorite rides. It is a close call between that and my C40, depends on the mood, but for high speed descents I prefer the Vitus.
IMHO the best aluminum frames ever made.