I scored a Fuzz50. The demo sold me; great cleanup with the guitar's volume control is something I value highly. It's prebiased- just a single knob, for output level. I hope it will do as well with singlecoils as with humbuckers. A good FF with a Strat is just magic.
I have a Tweakfuzz that's FF based but I haven't been able to love it. Found myself turning mostly to Lovepedal's (ToneBender-derived) MkIII or sometimes to a (Muff-based) VFE Red Horse, although the VFE's six knobs kinda take it more into distortion box territory than basic fuzz. I look forward to having a more more useful FuzzFace in the toolkit.