Pinky, I wouldnt worry about the carbon rear end (seat stay). Your back will thank you. I've been on all aluminum bikes for the last few years & you never notice the beating you take until you ride something like this. My race bikes this year are very similar to this frame & with carbon fork they are super smooth, especially on bumpy grassy courses. Of course a nice set of tubbies w/ low pressure helps too
. Your price ($800ish) is a very good deal for a complete, race ready crosser. Go for it!