Does the frame fit you? is it $300 worth lighter than your 1.3? Do you like the much racier geometry?

Personally ... yes, I think I'd do it ... depending entirely on the weight and condition of the carbon frame. But it seems you have a 22-ish-lb aluminum bike with decent gear. You would be getting a what? 20-ish-lb carbon bike with an unknown history?

I can't find a weight for the bike online, but I haven't read any bad reviews.