My wife has a Tarmac Elite and it's a nice bike. There are different grades of carbon now which I don't expend any effort to try to understand, but I think the Elite is maybe one level lower than the S-Works stuff, then sold with mid range group (although my wife's has DA upgrade). If I had your stable I would look at it as replacement for the Felt Aluminum. I don't have any real qualms about used CF, the Tarmac was bought used and I have 2 CF Colnagos that Ive been riding for 10+ years that I bought used.