I ride my circa 1995 Trek 2120 CF bike everyday to work, it's been fine for the past 2 years, and considering the overall age of the bike I'd say it's held up very well. I think it's weird that a lot of other posters are making comments about needing racks and panniers for commuting to work....like, what the heck do you need to carry to work that requires it? It's a commute, not a tour.
So far it's my favorite commuter bike compared to my steel bikes (Fuji America, Specialized Allegre, Retrospec Mantra). I'd recommend an old used CF bike over brand new Chinese carbon. You can get them much cheaper and the quality control is less of a concern.