I stand by what I first said.... If it was the difference between a full CF frame and an aluminum I would go with the better frame, but the carbon seat stays do about at much as a good seatpost it's very neglegable. I picked the 2.3 for it's wheelset and components because the frame on my other choice was about the same. I've ridden several aluminum frames plus an aluminum frame with carbon seatstays and they are nothing like carbon... Th seatstays make hardly any difference