I've owned quite a few, still own many. Had my P3AT since 2003, had issues with the mag release initially (was a problem on the first gens), and the hammer spring broke in 2010 (no idea what round count was). Otherwise, it's been a reliable little gun.
Bought a PF9 in 2007, carried it quite a bit, overall great value. Never had any issues with that one.
P32 ran fine, but I never carried it, sold it to a buddy.
PMR-30 busted the take down pin somewhere around 1,200 rounds, has gone at least that many on the replacement. Had one bad magazine, but otherwise no issues.
Have owned 2 PLR-16s, sold one, no plans to offload the other. Don't ever recall a failure with them.
In short, KT guns are GTG after the usual autoloader litmus test.
I also want to add that Kel Tec's P32, P3AT, PF9, & P11 are all some combination of smallest, lightest, thinnest, & highest capacity in their class.
PF9 did lose it's accolades to the Diamondback DB9, which is smaller, thinner and lighter.