I can't speak for the IIC+ but I could NEVER get my Master up past 3 (much less 5 or 6, wtf) on my Mark IV or it would be too loud for live band use. The taper on the IV's is NOT linear, it's exponential.
Interesting. Yeah, I sold the Mark V after a couple years b/c it sounded "small" no matter how loud I cranked it. Too compressed. Lifeless. The Mark IV is still the benchmark for me on pure aggression and openness. Curious how the VII compares.
Agreed. All the "in-between" tones of my Mark amps are just lesser versions of the lead channel. None wow me enough to ever use them. In fact, all they do is piss me off and make me wish I was playing a real Marshall, Fender etc.
Marks are great if you want great clean tones and that Metallica-style tight dry gain. It doesn't sound or feel anything like an 800 though. It won't cut through a live band mix near as well because of the compression.