Sig Mosquito, tried about 7 or 8 kinds of ammo, and nothing worked. So I bought it, shot, or tried to shoot it, then sold it, all in less than a week. I also traded for a Taurus 94 Stainless revolver. It would not always turn, would lock up. Had the safety thing on the back, I think there was something wrong with it. I had it for about 2 weeks before I got rid of it.
SW9VE. Reliable, but horrible trigger pull. Did all I could to try and make it shootable, but didn't help enough. I'd have no problem using it if I had to, but it never makes it's way into the range bag. It does a good job of holding down my passport in the gun safe though...