I've not personally purchased through CMP, but my shooting buddies have. I've run their Garands and they're nice - rack ones go bang accurately and one buddy who ordered a higher grade one, actually got a rifle that looked like it had never been fired (still shaved brass from casings while he was breaking it in).
Go for it. Price is right and you can't beat the deal of the USG sending a piece of US history right to your doorstep.