A) Insanely loud!! Basically two heads in one!
B) It's distinct in that it uses 6L6 or el34, easy to swap out with bias switch but I recommend doing so with Mesa power tubes only since Mesa test and grades their own tubes. Bear in mind it does NOT have the "dual" rec feature, only silicon.
C) It has a switchable "Modern" mode, which is basically the ferocious, somewhat fizzy, ballsy tone that the Dual-Rec is known for.
D) Tone wise, it's very tight, heavy low end, best suited for high gain Soldano style preamps (5150, Rec, ENGL, etc.) And best suited for a crushing live rig.
E) VHT is no longer, this is significant in the service that Fryette provides. Without bad mouthing anyone, my guitarist needed tubes for his 2:50:2. The new tubes sounded like crap, he was told they were the same "Russian" tubes used in all their products. Took it to the studio, still sounded like crap. Fryette guy insisted they were the best tubes, suggested preamp issues (CAE 3+) Swapped out the power tubes with my backup set of JJ's, it sounded great again! The tubes that were installed were garbage chinese el34's, worst sounding tubes I've ever heard in my life, and I'm no cork sniffer or anything, just go by ear. Hours upon hours wasted on troubleshooting and driving and phone calls over untested tubes and arrogance. On the flip side, I've purchase Mesa tubes to throw into Marshall and Laney, and they are always phenomenal sounding, tested for quality and tone by Mesa, you never have to re-bias if you stick with Mesa tubes as they all must match.