I recently saw this when I went to look up some info on my AT2007. Pretty cool if you ask me and I'd be very curious to try them out. I have owned 4 ATI amp, 2 of which I still own (AT1505, AT1504, AT2007, AT6003). The 1505 was the first real amp I ever owned way back in '00 or thereabouts. I've done the audiophile merry-go-round for years, with big ventures into tubes and digital amps, but ATI amps are neutral, bullet-proof (that is a big consideration in his engineering), reasonably priced, and measure well, so when it came to amps for my HT, I went back to ATI.
I'd say that Morris Kessler, who is a very competent engineer, to choose the ncore modules says a lot about his confidence in the design. It is interesting that he stuck with linear power, but not shocking.
The other thing I noticed is that he is using "NC500" modules and his power output is 300w/4ohms (unless you opt for the dual modules per channel) whereas the OEM NC400 is 400w/4ohms. That seems a bit odd in naming. Or maybe he is being much more conservative on power rating....or his linear power supply is the limiter.