My Kahr built Auto-Ordnance was a moderately good 1911 (in it's price range). Like all low to mid range 1911s, it had it's minor issues. Many of which was remedied by myself. It served as good range toy and home defense gun while I had it. Then again, this was a 1911 and there's huge knowledge base out there as well a zillion after market parts.
As far as their other offerings, I'm sure most are probably good quality, but I just can't bring myself to buy another Kahr strictly for self-defense or conceal carry.
I had a all-steel K9 that remained unreliable despite two return trips to the factory. Multiple failures to feed no matter what ammo I used, including fmj ball. After the second trip, reliability did improve, but it was still not 100%. What really soured me on the Kahrs was this one incident that occurred to me one night in CT back in '96.
I was at an Western Connecticut State University off-campus location for professional training. I was parked in a public, indoor lot and was in my car going through my bags looking for books or something when I spotted a young man dressed in "Gangsta" attire approach my aisle in the lot. It was a warm night so he was wearing a white t-shirt. Not nearly enough to conceal the Beretta 92 that he had tucked in his baggy pants. My range bag was in the car at the time so I Immediately reached for my Kahr K9 and a mag full of 124gr CCI Gold Dots. While not great, it was still the most reliable jhp I tested for the gun at the time.
The gun jammed on the first round after raking the slide. As he got closer, I drop mag, cleared the gun, and tried again. Once again, jammed on the second round. At this point, I tossed the gun aside and grabbed my SW jframe. Better than nothing I suppose.
As it turned out, the guy just kept on walking and went straight to his car. I surmised he was probably just a student or employee and carrying because he was afraid of getting mugged or something. This was not the safest place in town after all. After that night, I decided the Kahr had to go and traded it away at a loss. Ever since then, I've shied away from all Kahrs products completely until I picked up the Auto-Ordnance. Even then, it was intended as a project gun and not something I would stake my life on. To this day, I wonder what a pickle I would have been in if I had shoot it out with a guy so much better armed than I was.
As a side note, I had a friend who picked up a K40 at the same time I picked up my K9. The gun was a lemon for him too and thankfully, he was never put in the same situation as I was.