I had a PF9 and didn't like it. Wasn't entirely reliable and the trigger was horrible. That said, if you put through the test rounds and it is reliable and you are accurate with it, that is the main thing. There are plenty of other brands I would recommend over Kel-tec, but for the money they are pretty good.
I agree with the above.
I liked how it fit in my pocket. But mine was totally untrustworthy.
So, perhaps you can get 200-300 rounds through it. What's it's durability like after than. It's a crap shoot in my opinion. The materials aren't that great and the design is questionable. Just takes a few left turns of that extractor screw and you'll see that firing pin shoot back at you.
Just my opinion based on my experience. Sorry if it makes some mad, but that's what the OP was asking for.