Hi! I have the Randall RM100KH (Kirk Hammett) signature head. Tried many modules and they give you 90% of the sound to which they made of. If you want a Marshall sound, just try the plexi module and you got it, and if you want a Boogie, then try the Grail module from George Lynch. I use the KH1,KH2 & KH3 modules which came with the amp, and they sound killer to me. It's a versatile amp and gives you want you need. Just take time with setting up the EQ, presence and density.