pf-9, which i own, is 7+1, & has been very sketchy in the reliability dept, for me. I never carry mine, because of that. It will fte &/or stovepipe much too often to make it a reliable carry piece. The sccy, OTOH, is 11+1, has been completely reliable.. as much as a glock, beretta, or any high end semiauto. OF course, YMMV, & this is just my personal experience with the pf9. I've tried the fluff & buff, but it is too fussy about ammo & i have found none that have been completely reliable with it. The sccy is a much tighter engineered tool, & has better fit & finish. I have several kel tec firearms, & perhaps i got a lemon with my pf9. But i could never recommend it to anyone, based on my experience with it.
I have been intending on calling KT to see if there is something they can do, but procrastination always gets the best of me. I've had this for several years, & occasionally go through a time where i really try to make it work, but so far, it hasn't.