There are several threads about the Sig currently. Some people (me included) have had problems with them, most, it seems, have not. It's hit or miss. Great shooting gun, very accurate, low recoil for a gun its size.
Mine was sent back to Sig twice and they are replacing it, seems to me that is something major. I'm not sure if I'll keep it. Sucks, I really liked the gun.
I have shot the Kahr.