I have owned an E9 ("economy" version of the K9) and a PM9, but no .45s.
The E9 never had any stoppages, but did bounce the odd case back at my head as well as the front sight (plastic and staked) falling off. After sending it back to customer service (a painless process save that I had to ship it) it came back with the ejection port lowered and a new front sight which gave me no further problems. The PM9 had severe functioning problems at first, but came back - albeit taking nearly a month - with a new barrel and recoil spring and also gave me no further problems.
The best features of the E9 were its grip and hand fit, handling and pointing qualities and its trigger. It - like all Kahrs - has a long pull like that of a revolver, but is light with even pressure all the way through and somewhat of a "surprise" at the end. After a little practice you can do some very good work with this trigger. It is also very comfortable to shoot due to its weight and cushioned rubber grip. Because of its small size, the PM9, if I held my trigger finger so as not to push all the shots to the left, would rub and blister the finger on the bottom of the trigger guard. Otherwise it too shot decently, much better than any small-frame revolver I've tried.
An annoyance is the top round in the spare magazine working loose of its own accord. You don't notice this in the "in-gun" mag, but can be a problem in the spare mag. You need a snugly fitting mag pouch and draw technique (pulling straight up and not dragging the sides of the pouch) to keep this from happening, or there can be problems inserting it into the well.
All in all, I would happily buy a steel 9mm Kahr again, but am ambivalent about a PM or CM9 . I don't think, however, the CW45 will make a good practical, continuous carry pocket gun; it is just too large. It would be OK for sticking in your pocket for short times and distances.