I bought one, picked it up first week in Jan. Out of the box it would fail to fire about 7 of the 10 rounds in a mag. Appeared to be light primer strikes, and I tried 4 types of ammo - Winchester 40g hp, Winchester 36g hp, Federal Auto Match 40g, and Remington Golden 40g. Ruger customer service was super, I had the gun back in less than 2 weeks. They replaced the barrel and tes fired with Aguila & Federal ammo. I was told they didn't recommend Winchester ammo (I didn't ask why - wish now that I had). At any rate, it now fires reliably with the Federal and Remington ammo and I haven't had a single fail to fire or fail to feed. Wincheater ammo doesn't fire at all - even less than before. So in this regard, I'm less than satisfied - every .22 I've ever owned has preferred some brands over others but never to the degree that some wouldn't fire.
But the little gun is accurate, off a rest I get mostly 2-3" groups at 15 yds. And it shoots almost to point of aim. The safety doesn't bother me - I just ignore it. There are slight dimensional differences between this one and my original LCP enough that it might not be able to share a Kydex holster. The LCPII is a tight fit in my leather IWB holster that is a perfect fit for my LCP. But all-in-all this is a really fun gun to shoot.
Maybe some of you have an idea why Winchester ammo won't fire reliably. Harder or thicker brass?