Re: Randall RM4 modular preamps?
I have an RM4, RM20, and RM100 Scott Ian. I have limited experience with stock modules besides the 3 Scott Ian mods and a self-modded Top Boost. The SI mods are actually pretty good. It's definitely Scott's tone from the early albums. Not as gain heavy as you'd expect for a thrash legend, but I think that's the problem with so many young guitarists is that they equate more gain = better heavier tone. Not necessarily the case.
As for the modded modules, they completely are game changers. They get pretty close to the original amps tone and/or feel, but have the modders take on those specific amps. Truthfully, some of the mods I like better than the original amp it's modelled after. I have mods based on the Bogner Fish, Bogner Ecstasy, Bogner Uberschall, VHT 50/ST, VHT UltraLead, Dimebag's Vulgar tone, Marshall 1959RR, Trainwreck Express, Mesa Mark, and Framus Cobra amps. They all offer something different in tone and feel. Yes, they could be tweaked to sound similar, but they come accross differently with compression, gain, sustain, etc.
All that to say, I'm a big fan of the MTS system and modded modules. If you're willing to invest in modded modules, give the MTS system a try. If not, I'd let it pass you by as some of the stock mods can be muddy or generic.