I have a CW9 and a CT380. I have no negative feedback for the CW9. It's everything I want and need in a CCW. Light weight, thin, points well, shoots well, and accurate. I carry AIWB at 12 o'clock and it disappears under an untucked shirt.
The CT380 is the same for me, but I'm the only one in my family that can make it run. My wife and daughters can't rack it or shoot it consistently. Any grip issues and it will jam. I imagine the CW380 would be worse. Since the CT380 was to be my wife's daily carry, I'm probably going to trade it off soon.
I thought about a CM9, but I don't see the point of going smaller because the CW9 is small enough to suit all my needs.
I don't have any experience with Kahr's customer service.
I carry in a holster similar to the Clinger Atom which can be found new on eBay.
KahrTalk forum is the best source of information about the Kahrs.