i agree that the geometry is weird. i don't have an excellent grasp of sizing and geometry, but the steep seat tubes lead to these short head tubes, but everything else seems to be weirdly in proportion (on the few colnagos i've ridden, anyway) and i've found that if you just move up by one size, you get a frame that fits.

anyway, otherwise, they are nice frames, but with the exception of some classic steel models, i can't say that they strike me as a particularly good value. you can get a lot more bang for your buck in terms of aluminum framesets, imo. (cannondale and felt, among others)