it's a great frame, and as others have already said, very capable of being upgraded later on down the line.

I don't have one myself, but have ridden one and I would need a 52cm frame since the caad8 has a long-ish toptube even though I'm 5'10/11" as I have long legs / short torso.
I think the frame geometry specs are still on the cannondale website, so you should check that out.

Having said all that, if I could justify getting yet another bike, it would ideally be a Cannondale...