I bought my 2010 sight unseen from carmax. No problems. I really don't think there'd be many problems with them yet, as most should be at about the 12-15k mark.
Man, I've test driven a few cars but never have I struggled that much to keep a poker face at the negotiation table. Excuse the poor picture. My camera is older than you.
I bought my '05 GT from CarMax as well....they were really great to deal with. Not much haggling with them. Which is good, because my poker face was gone on the test drive with the salesman in the car when I went into the highway onramp getting sideways, and hit 80 before I merged with traffic. The salesman said "I think you found your car".....I had to agree.
My wife didn't even know that I was seriously looking for another car until I called her at 7:00 at night and told her to grab the title for my truck and bring it to me....LOL
Congrats! I still have a hard time not looking silly driving mine. I let my wife do the yea/nay on the dealing with the salesman, 'cause my haggling ability was never there.