So far, at about 70 hours, I am amazed at how much better my system sounds than with my prior amp, the McC DNA-500. The bass is actually a little deeper, a little faster and much more palpable than before. If I wasn't hearing it, I wouldn't believe it, since the DNA-500 is excellent in that area. My speakers are Legacy Whispers, with lots of bass drivers and relatively efficient(94). As far as mids and highs are concerned, there is a much greater sense of air around the instruments and much better imaging as well as depth of soundstage. To summarize so far - very fast, incredible bass reproduction, natural decay to instruments and voices - no coloration at all - you just hear the music as it was meant to be heard. This amp sounds like it is in a league of its own and its still not hardly broken in yet!(no, I haven't heard every amp and have no desire to hear others at this point). I can now better appreciate why Kevin was so enthusiastic in discussing the Phi 300 last year - he has really designed a great amp. I will post more impressions as the 300.1 breaks in.
I am using the 8 ohm taps and UL mode.