I have the nad c275. Have had it for a few months now, and wow, it just gets better by the week. I have a nad c372 also, but no comparison. The c372 is very neutral, but so is the 275, but with the 275 just being more of everything. It has tons of clean power, fantastic bass, mids, and clean treble.
I am so impressed with this amp. My listening pleasure has jumped up a staggering level with this.
Btw, I am using the preamp from my nad T753 to send the front mains signal to the 275. So I am getting great 2-channel listening, plus much better surround use also as it drives the mains in either 2-channel or surround.
You can't go wrong with this amp. Just check out the reviews also in Stereophile for the 375 integrated (uses the 275 amp section basically), and review in the Hi-Fi news for the 275. Those that review either the 375 or the 275 are blown away. Michael Fremer in Stereophile said to check these out if you are thinking of spending even up to $10,000 for a amp. Yes, his comments in the last edition of Stereophile.