They’re brilliant frames, ever so stiff and efficient but fairly comfy! I have a 2011 Advanced with Ultegra and the essential carbon steerer and it’s lovely, a big step on from the older TCR that it replaced, even if it’s not as good looking!
Re fit; I’m just over 6’1″, a bit lanky and ride a M/L, if I was any taller with the same proportions I’d be on a L.
Re quality, I have known of 2 that have cracked at the driveside chainstay/BB join but both replced by Giant, no questions asked.