I'm still a new owner, but I think this is a great car. The power is great, and as a racecar driver, the handling is impressively good. Even my wife, who has no interest in cars, likes it. The interior has just had some minor upgrades and seems fine to me. The seats are comfortable and the controls come to hand nicely. Very little noise gets inside the car either. Unfortunately this also makes the car's occasional squeeks from the roof latches stand out more. I guess GM has a fix coming soon for this problem. Another niggle is the occasional nanny warnings from the computer. You can't open the doors with the engine running and it'll even warn you if you leave the turn signal on too long.
Power, handling. Reasonably comfortable to live with daily. Will get mid-20mpgs if driven conservatively.
Full hardtop, more control over computer's nannying.