I have two of them, both for a PF9, and both left-handed. One is a belt-slide OWB holster with no retention feature. It's my EDC holster, on me pretty much any time I'm up and not at work (including right now as I type this.)
The other is an IWB rig with a steel belt clip and a "sweat shield" strip. Like the other, there is no retention feature, such as a strap or thumb-break. I don't wear it IWB; I wear it between the belt and pants, as I find true IWB-carry uncomfortable.
Both work well, but they are indeed stiff and that causes them to be creaky. I've been wearing the OWB one for about a year now, and it still isn't "broken in" that I can tell. Even though both are made for the PF9, the IWB one seats the gun lower in the rig, making it a little harder to get good purchase on the gun for draw. My Bersa Thunder 380 actually fits in that one better.