Kel-Tec PF9 is the only pistol a didn't care for.
I work with a guy that carries his everyday so I figured I'd buy one. At $200 to $300 new I thought it wouldn't hurt to try. First trip out to the range I ran 3 full magazines through it before it stopped working. Didn't have FTEs or FTFs, it just completely stopped operating. The trigger would not engage anything and as I pulled it I could see the hammer just sitting there, not moving at all. Took it home and cleaned the crap out of it. Went back to the range and got off 2 rounds before the same thing happened. I discovered that the trigger would function only if I pushed it to the left as a pulled it back. Got rid of it the next day. Recently bought a Sig P938 and that gun as an absolute blast to shoot. Not one single malfunction of any kind.
"The Constitution shall never be construed to prevent the people of the United States who are peaceable citizens from keeping their own arms."
- Samuel Adams