I ordered a Black Spirit from GC as soon as they came out, but ended up returning it:
Upon first plugging in, I was immediately impressed by the clean and crunch channels. IMO for clean to ACDC crunch and even Jethro Tull and beyond, these two channels just kill it. Very responsive controls, awesome feel, and by adjusting the power scaling, sag, boost, and gain you can get damn near whatever you want, even Sabbath. From chimey cleans to super juicy, thick leads. But I really didn't buy it for these sounds, as I already have them covered with other gear.
Then I switched to channel 3 and it was like a wall of nasally limp dicks. Some extreme EQ settings helped to get the 80's thrash going, but I wasn't sold. Channel 4 goes big and scooped, with tons of low end and gain, but it definitely reminded me of Dimebag's tone and that is not something I'm shooting for.
I actually think this is a nice amp, and will suit many player's needs with convenience and loads of useful features. I was hoping for a 5153 type sound in a smaller footprint, and while it almost gets there, the high gain tones didn't leave me feeling inspired like a tube amp does. But I'd consider buying it for channels 1 and 2 alone.