I can attest since I was there. Scott's Charvels and the Roxy and Wicked 8 were incredible. Both pickups had a clarity under high gain I've not experienced before. I usually play Duncan Custom 8's and I love those, but these were on another level for sure. I want to replace my Custom 8's with either of Scott's two concoctions.
As far as the amps, the Ground Zero MOAB was my favorite, and that's comparing to some already great amps. It was so versatile and had THAT sound. I could easily make it do AFD/Slash, or some raw AIC ala FL and Dirt, and early Metallica easy. Great range on the EQ on all knobs, which I don't understand why all amps don't do this. The features it has is what I would want on all of my amps.
I was happy to see, though, that the Splawn could hang with it pretty well. The TNV100 was also badass. I'd like to spend more time with that one.
@harddriver The BFG is an earlier Engater Seminar Head, 4 gain stages, an AFD switch to get closer to Slash's early tone and UYI tones, and Thump and Negative Feedback on the back. Also has a foot-switchable solo/volume boost with its own knob and foot-switchable OD, as Splawn has on his amps. I'll never sell that amp as the EQ has so much range in it and it's a beast at 50w...It's been a gigging head, and/or a backup to my Splawn when I was gigging regularly. Cuts very well. ...I wish Brian would have stayed in the game; great dude.
Something I noticed. At these 9:00+ volumes, I noticed I backed off the gain, especially if I wanted to use a boost, and when I increased the gain a bit on the heads, I did not need a boost to get the saturation and tightness that I like for rhythm and leads. I preferred these heads at these volumes without the boosts.
My left ear is still ringing pretty loud. Forgot to wear my earplugs.