Welding talk aside, I feel like the 10 is probably an awesome bike but slightly under built. The top tube seems to be the weak point here. I've seen this on the interwebz before and recently happened to a friend of mine. Leaning the bike agains a pole caused a small dent in the top tube! Not taking crash or dropping the bike. The top tube is apparently very thin on the 10 bikes. Love my CAAD8 with optima tubing. It's not very different from the 9 and feels well made and solid while weighing 1188 grams for a 54cm frame.