I have used the Ventoux 2's for the last 4 years and 20k+ miles on 2 bikes. Just had one set start "clicking", so replaced them with the Z11. As Long said, the Z11s are harder to clip out of, and seem to have less float, though it might be because they are new (less than 200 miles). Also the Z11s are much prettier, polished aluminum instead of painted as the Ventoux are. The Z11s have exposed innards, while the Ventouxs are sealed, so if you ride in wet dirty conditions this may help your decision. The Z11s are only a few $$ more and more attractive, but the Ventouxs are fine.
Last edited by Halfast; 02-14-09 at 05:29 PM.