I have only been in Fractal land for 8 days, 7 of it playing into the FR-12. I am having to get used to the whole FRFR sound thing. I am used to playing live amps into speakers, I mostly play a Tone King Imperial MKII and a Friedman Twin Sister into Scumback loaded 2x12's.
This sounds way different, not bad, but definitely not amp in the room sound. I guess I just have to get used to it. Hiss is not bothering me, mine is so low you have to be quiet and listen for it to notice.
I did try it with my PS-100m and a 1x12 cabinet loaded with a Fat Jimmy speaker. Turned cabs off, turned down speaker resonance on the models I tried. Also put in an EQ shelf starting about 6k. Man this sounds great! I would say at least 95% as good as the real thing, maybe better.
Playing into headphones sounds good, but always sounds like playing through headphones.
I guess I just need to give it more time with this speaker. Just a different experience.