INF 3 and 4 user here(on my ibby 370dx, had no time and budget to upgrade its pickups
)
some of my short thoughts:
on clean: its too gritty but rolling back the volume will help clean up its grit and harshness
on dist: i like lots of treble in my mix but when you mix it in your eq, turn down the treble and push the bass up, see where it goes from there(depending on the distortion you will use)
overall: its good
enough for my taste, a lot will say that these pickups suck, but they just need to learn to tweak it more and tame it more
but id rather go with Dimarzios