OP here. Still loving the FM3 in 4cm.
I've now taken my real drive pedals off my board and am trying out using just the Fractal drives. Thanks to help in another thread, I've gotten very close to replicating my Keeley Fuzz Head, which has been a tricky one to nail, using the Face Fuzz. Also have gotten really close to my MXR CBMOD using the SD1 model. We'll see how it goes! (Haven't sold the pedals, haha.)
Also, the other day I tried plugging into my Electra Dyne just using my pedals in front, old school, and noticed that it had actually sounded better with the FM3 in 4cm, even with no effects activated. Must be the buffers, etc (even though I use a Mesa Stowaway at the front of my pedals, Fractal's seems better...).
I compared my Whirlwind Orange Box - which has been my favourite phase for years - to the Fractal's Phase 90 and liked Fractal's better. (This wasn't the case with my HXFX; it's Phase 90 sucked in comparison to the real pedal.) And finally, I replaced my EVH wah with a Dunlop mini-expression and the Color-tone model.
So, I've gone "full Fractal" in terms of my pedalboard. Sounds amazing and is super fun!
I'm enjoying trying to get the most out of the FM3's three switches, too. I have the Mosky Dual Switch, but am leaving it off for now and seeing what I can get out of just the three-switch approach.