Been through every single amp channel model, and overall everything in Q8 sounds amazing here!
The modern high-gain stuff has never sounded better to me on my Atomic CLR FRFRs. Getting the gain, compression, sustain-y singing and squealing feedback a real amp does!
In a studio "blind" A/B test, I'm pretty sure people could not tell the difference...and if they had to pick, I bet in most cases they would pick the model over the real amp as sounding better!
As to possible issues/bugs, here is what I came across going through all of them...The Swart and Gibson Scout amp models, along with the early Tweed Princeton, Tweed Champ and Tweed Deluxe, have that issue in common I believe and Cliff is aware as he posted above, so a fix should be coming.
I noticed the Cameron CCV is defaulting on master volume to 5, but it sounds better set at 7 -- check that out. Also hearing some pronounced crossover distortion just on the Cameron CCV 1B amp channel model (similar to Tweed/Scout issue), but I don't own this amp/never played real one, so maybe "that's just how it sounds."
Had to reset only a other amp few blocks: the Matchless Chieftain, the Trainwreck Express, and Komet, and noticed a change in sound when I did, BUT that may be a legacy issue from my prior amp bank that needed an amp reset/update anyway.
All in all, totally digging this firmware Q8! Hard to keep up, but Cliff's constant chasing of perfection makes us all ultimate winners in his achieving success!