I have a C370 of which I only use the power section, so effectively a C270. Hooking up a quality pre-amp to this (I use either a lightspeed or Primare P30) makes a massive difference. The C370 as an integrated is pretty good and deserves all the praise it gets, but the power section is in another league imo. I've moved on to mainly Primare gear but use the NAD setup as a backup / second system. It's good enough that while the Primare is better I don't miss it and would be perfectly happy if I had to go back to the NAD power amp full time.
I recently had my C370 recapped and generally refurbished. The engineer, who obviously gets to see a variety of gear including some pretty nice stuff, started out telling me that I was wasting my money having that much work done on a basic amp. When he'd finished the work, run some tests and listened to it for a while he told me he'd changed his mind completely and was now a big fan.
As has been mentioned it has a lot of grunt and can handle heavy loads. There's test results for 2ohm on that old
stereophile review. I'm not sure I'd run it like that long term, but does show the muscle of the thing. I also like the ability to separate the pre and power sections. Is a most versatile amp and thoroughly recommended.
I'll post the engineers test results for mine when I can dig out an electronic copy. The C370/270 is actually rated at 120w into 8ohms, the C372 was 150w iirc, but my C370 put out 150 when tested. NAD do tend to under rate their power figures.
Finally, I'm in england so this might only be over here but: I'm a compulsive ebay lurker and I keep half an eye on second hand values of it. A year or so ago they were going for about £200 but lately I've seen some change hands for closer to £300. If you didn't like it I don't think you'd have a problem getting your money back when reselling.