I've been carrying, and shooting regularly with, my PM9 for several months, now.
It's been absolutely reliable, reasonably accurate, and extremely comfortable to carry.
There may be other guns as good for CCW, but I can't conceive of one that would be better.
Certainly it out-classes my old Kel-Tec P11, in every way save price. (And while it's not quite as accurate as my Beretta and my CZ, it's a lot easier to lug around.)
I'm using a FIST K1 holster, with all belt-loops removed, and some stick-on 3M velcro from the hardware store stuck on the outside of the holster.
This sticks to an elastic belt with sew-on velcro from the fabric store sewn to the inside of the belt, which I then wear inside my pants, over the tail of my shirt.
I position the holster in different places, depending upon my dress. With khakis and a polo shirt, it's entirely below the belt, where I can grab my belt with my thumb, and the bottom of the holster with the tips of my fingers through the fabric of my slacks, so as to quickly pull it into an IWB position.
If I'm wearing a jacket, I might pull it into IWB position.
In fact, the PM9's small enough that I can pull it into a low-seated IWB position, and just blouse a bit of short over it, and rarely draw attention.
I originally started wearing it this way in response to my difficulties with "tuckable" IWB holsters - I found it very difficult to get my shirt tail tucked into the gap in the holster, while holding up my unbuckled pants and the weight of the holstered gun. I thought it'd be easier to buckle the elastic belt over my shorts, lay the shirt over that, and then put on my pants. And it is. But I've found that it's faster, for me, to pull the holster up to an IWB position from below the belt line than it is to pull my shirt tail out of the way.
When I'm wearing a winter coat, I pull the entire holster out, and stick it into my coat pocket, where I've sewn another bit of velcro.
When I'm going somewhere I can't carry, again the entire holster comes out, and goes into a day planner with the guts removed, and yet more velcro. This gives me the option of carrying it into a restroom to put it on again, without scaring the natives. (I'm no great fan of off-body carry, and would not recommend a dayplanner as a normal means of carry).
I haven't, as yet, tried to carry with this gun and holster in a pants pocket - I only do pocket carry in my winter coat, which I haven't needed to do very often, so far.
I really like the ability to move the gun around without unholstering it. At home, again, it comes off the belt and into the box, without coming out of the holster.