The S5 Cervelo is a nice bike, as is the S3 (and S2 for that matter). But none of these aero bikes have the feel and comfort of the Tarmac - at least to me. And with a rider on the bike, the aero frame advantage becomes all but moot. I've thought hard about getting an aero bike for my winters in Florida but, every time I try one I always come back saying that I will just keep riding my Tarmac. If I was a competitive racer then maybe I'd get one but, as a group rider its just not worth the tradeoff in feel and comfort to me. Each person is different though, and some think the Venge rides every bit as good as the Tarmac. More power to them. Nevertheless, I look forward to a new Venge - when that time eventually comes.