I have a PM45, which is only slightly larger and heavier.
The build quality is very high, and the trigger pull is long but smooth and light (6.5#). The long pull blocks the firing pin in lieu of a separate thumb safety. It is accurate and easy to shoot.
On the negative side, the slide is very hard to rack and load. Kahr recommends you lock the slide back and release it to charge the chamber. It is also hard to clear for the same reason, plus there is barely enough clearance for a loaded cartridge in the ejection port.
The chamber is very short, so the OAL is critical. If the bullet lodges in the rifling, it is very hard to clear safely. Kahr doesn't recommend using reloads, but they work for me if I keep the OAL on the short side - 1.250" for FMJ and 1.230" for Hornady XTP (.45 ACP).
I suspect 9 mm would be similar. I suggest doing a "plunk" test on the barrel with new or reloaded ammunition.
The little gun is a PM or CW. The CM9 might be large for ankle carry.