My experience with a few of my pocket holsters and the CM9.
I initially thought I had found my favorite with the Blackhawk #3, and I do still find it comfortable and takes up very little pocket space. The gun fits in the holster nicely. But over time I've found two issues that I don't prefer. One, most of the time when I draw the holster comes right out with it. Two, I don't feel it offers enough protection to the gun just in case I happen to bump into something. Just personal preferences.
The Desantis is a nice alternative. The holster stays in the pocket and the rubberized shell offers much more protection when compared to the super thin Blackhawk. However the stock Desantis does require some alteration. The holster's stiching does not fit the CM9's trigger guard. After snipping a few stiches and replacing a few the rear sight now fits down into the holster where it should and gun fits properly. Its not quite as comfortable as the Blackhawk or the Sticky but works well.
The Sticky MD1 is also working better after some alteration as well. My first negative impression has changed. At first I found the gun to move around too much in the holster so some stiching was required to snug it up. After doing that it works much better for me. I do find the Desantis a tad thinner but the difference isn't that much. The Sticky is more comfortable to me, doesn't take up so much pocket space width, protects the gun well, and stays in the holster reliably when drawn.
Of the 3 I've been leaning towards the Sticky. I see a few other options on the Kahr website for pocket carry and I'm quite sure over time I'm going to wind up with half a dozen or so holsters.