I'm not one to avoid spending money on my roadie, as long as I'm going to get something for doing so. The other bikes I'll spend less intentionally. But the roadie gets spoiled. I just couldn't justify it. It would look all kinds of cool, but it wouldn't do a damned thing more than the alloy version will do.
OTOH, and in what may be one of my stronger statements concerning hypocracy, I do dig on the Zero G brakes. Maybe if and when I build up a weight weenie bike I'll do carbon everything and Zero G's. Hell, you can't take the money with you, right?