I have heard McCormack at a dealer. Liked it, but it had a somewhat forward sound and a little bit of glare in the treble, although I notice this sort of thing more than most, as I am very sensitive to anything that sounds remotely bright. And, admittedly the sound quality may have been affected by speakers being used -- Gallo Ref 3.5s. (This was also a stock McCormack I heard, not a modded unit.)
I own a Pass150.5, which I like better than what I recall of the McCormack. The Pass has excellent detail and a bit of warmth at medium volumes when it is operating in Class A. Pass also has great bass. I used to own a VAC Phi 200, a very good tube amp, and like the Pass better, for whatever that's worth. If you listen to rock music, the Pass is really excellent.
I own a Pass150.5, which I like better than what I recall of the McCormack. The Pass has excellent detail and a bit of warmth at medium volumes when it is operating in Class A. Pass also has great bass. I used to own a VAC Phi 200, a very good tube amp, and like the Pass better, for whatever that's worth. If you listen to rock music, the Pass is really excellent.