I weigh 160lbs and race crits and road races. I just sold my 38mm carbon clinchers and now do all training on Velocity A23's and use my tubulars for carbon racing. I put about 8-10K miles on my clinchers and they held up well. I just don't don't think there is that big of an advantage vs the alloys. The alloys work on all mountains, all weather, and are cheap to replace if I crash or take a pothole at 25mph. That's just me