No ATI amps, but compared to my Anthem, Bryston, and Parasound Halo amps, the M2200 sounded the same, but then even my AVR-X4400H sounded the same.    SQ in any of my systems depends practically only on one thing, that is, the recording/mastering quality of the media contents played!!   I could easily tell the difference between a nicely recorded/mastered piece (Flac, wave, PCM, DSD, whatever) and a not so well recorded/mastered one.     Also, my best CD sounded much better than my not so well recorded/mastered PCM 192/24, DSD128, 256, or SACDs.    It's not the amp when you get to the higher mid range AVRs or amps like Outlaw's, but I know it is hard to convince people..   Its easy to grab an amp, difficult to source the nice recorded/mastered media contents right?