My wife and I both own and carry Kahr CM9s. Both have been 100% reliable so far through ~400 rounds each.
In the past, I have owned two Kahr PM9s, a P45, a CW9, and a PM40. The PM9s were both 100% reliable, as was the CW9 and PM40. The P45 suffered from light strikes with certain types of ammo. The PM40 was downright unpleasant to shoot. I shot 155gr, 165gr, and 180gr bullets out of it and all hurt my hand after five shots or so.
I may sell/trade my CM9 for another PM9 with the black oxide finish one day, but that's low on my priorities list. My CM9 works just fine. I really like Kahr handguns and have for many years. They are well built and make excellent concealed carry guns. I have seen negative reviews posted about Kahr, but I have nothing but good things to say about them. I also carry one to protect myself and my family, which says a lot.