Mark IV is great amp. 5-Band EQ comes in handy when just a simple tweak between songs.
But Trem-o-Verb, two independent tones, gain, master controls, two mode settings for each channel and add switchable between tube or solid state rectifier ...
You may have started a big debate:
Less Filling, taste great.
Chevy - Ford
PC - Mac
Gibson - Fender
Sean Connery - Roger Moore
Dimarzio - Seymour Duncan ...