Not sure why you were concerned about the KelTec Pf9. Wiley Clap called it the best Keltec he hard ever seen and in his tests it was 100%. In fact, of the article he wrote about the single stack 9mm, it was the second most accurate. The Walther beat it by about 2/10th inch groups at 25 yards.I have always been a KT fan. Their ingenuity is unsurpassed by any in the market. I once carried a KT PF9 and did so for a long time. Until I came to the realization that, one day, my life might depend on it. I just could not trust it, not that it ever failed me. Kinda like grabbing an AR over an AK. Won't happen. I'll give up a lot for a gun I know is going to go 'bang' every time I pull that trigger.
When they first came out they had a few problems with the extractor, they never had a recall, but if you called them they send you new one free. I was concerned in 2015, so I called them and they explained the issue. So, they sent one, in 2015, mine has never jammed, failed to feed, nothing. I have a half dozen single stack guns that will fit in my pocket including the Glock 43, it stays in the safe and I carry the Pf9.
The PF9 is the most likely 9mm to limp wrist, because it weighs the least, 12.7 ounces, just simply math, a high velocity bullet needs a stable platform to hold the gun still while it escapes the barrel and the platform need to be held still so the slide can start forward. Any limp wrist and it is likely to jam. Anyway, many people simply cannot handle the recoil so the let them roll in the hand and the gun flops around and the next round up jams the gun because the empty did not get out of the gun.
Anyway, surprised you were worried about it. Mine has not had a failure in the nearly 8 years I have owned it. It is not a range gun, it is a combat gun. If I could buy them cheap I would probably buy a second one. I am not a Keltec fan, I have 2 the Pf9 and the Sub2000, the fold up 9mm carbine, they are both great.