I just want to add a couple of things.
One, I'm REALLY enjoying my new rig more each day as I'm learning how best to dial it in and making some corresponding adjustments to my M13 effect models. I also am very pleased with my FYD preamp. The reverb, in particular, is to die for - the lush, Fender-style tube-driven spring reverb many of us know and love.
Two, I'm so pleased with what Pat Hickman at Classic Tube Audio did for me in updating and upgrading my MC50, including adding a power switch, IEC power cord input, and 1/4" in and outs (far left = 4 ohms out; middle = 8 ohms out; right = input). It's powerful beyond words (look in the 2nd pic at where the volume knob is set - that was an hour ago playing along with a blasting stereo in a small music room) and so toneful. I'm getting sweet harmonic overtones, particularly on overdriven leads, that I never heard before from my Jerrycaster.
The FYD is "just" a BF TR preamp with Waldo's post-Alembic mods, same as the SMS, which I also own and dig, and the guitar hasn't changed so I know it's coming from either the MC50, E120, or both. I'll put my $ on the MC50 but am still experimenting with mixing and matching my two rigs' components.