Barry, all I can add...is what I've already told you in private. ATI certainly doesn't have much cache; it's plain-Jane to look at, and won't really make you the envy of your fellow audio/video-philes.
However...I'm tight with a dealer, who thinks Morris is a genius; and many "in-the-know", actually are aware...that Morris makes a lot of OEM circuits, for some hi-end/hi-tag badges. This dealer says the 6000 Signature series, is Morris' "baby". To me, that always bodes well; a designer's amp...like he were building it for himself.
That being said...I don't know anything about the Mac; so I'll be happy to hear other feedback and votes.