I haven't had the opportunity to fire a PF9, but I own one of the LC9. It's a little bigger than the PF9 in height/width/length, but we're talking fractions of an inch only. So, the LC9 is a little heavier, due to the extra size. Still conceals well. Fits into pockets rather well (using appropriate holsters).
Firing it's pretty nice. For a subcompact, the sights work well. I've not had it give me any issues with ammo. It's handled everything from Winchester white box 115g FMJ to Speer Gold Dot 124gr JHP (and a whole bunch of stufg in between) without issue.
In fact, the biggest problem I've had with it since I bought it was locating additional magazines. When I bought mine, every dealer (local and online) that I checked was out of stock on both the standard and extended floor plate magazines. That's not a problem right now. And if that's the only serious problem I've had with it, I'll count it as good.
I would definitely recommend finding one to rent to try for yourself.