I have a 2008 Madone 4.7, which is TCT carbon, with full Ultegra. I love the bike! I came off a Giant TCR, which was lighter, but the ride I get with the Madone is much better.

From what I read about the carbons on Trek's website, they are built to the same quality standards, it is merely the carbon fabric itself that is different. The TCT carbon is a heavier fabric than the OCLV fabric. But I love the ride. It's responsive without being twitchy, and it dampens the road vibration wonderfully. I'd definitely recommend it.