I got to play one... the response is very quick and smooth, it's not muddy at all... it's a very dark sounding amp, dark being, in this case, evil. A straight up metal amp in my opinion. Known for it's low end, and let me tell you this, palm mutes on this amp make your balls rattle... no joke. NOT a mid scooping amp it sounds great with the mids up there, generally worth the money.
Schecter C-7 Hellraiser --> Mesa/Boogie Dual Rectifier Trem-o-verb 212 Combo.
Martin DX-1 Non-electronics model.
Epiphone Gothic Les Paul Studio with EMG 81 and 85 (Sold, I miss you!!!)
"A Vulgar Display of Purism" -- John, about my rig.