I've carried a Kahr PM-40 (a .40 cal 17 oz subcompact striker-fired polymer pisol) since I bought it used maybe 6 years ago. No red dot, just good night sights. It is surprisingly easy to shoot well due to a long smooth trigger pull and a good lock up, but I can't stand to shoot it much due to the wrist breaking recoil. It is the pistol I use to convince new shooters not to buy a subcompact in .40 S&W. I carried the little hand canon in a Crossbreed IWB Supertuck, which was very comfortable but inconvenient.
When the P-07 arrived, I almost switched to it. But it is bulky with a fattened grip and I didn't like it IWB, again with a Crossbreed holster. I loved the 9mm and accuracy of the gun, however.
Last year, when the P-10C came out, I saw the answer--except I was skeptical of my ability to learn to shoot the gun well at first. Then came the CGW slide cut for the Burris, and the CGW co-witness front sight. Finally, I got what I always wanted, a red dot on a 4" gun in 9mm that was comfortable to carry and light. And I have lots of rounds through it now and am comfortable with the co-witness sight arrangement. This time I got a Crossbreed OWB holster, since I wanted the convenience of OWB and never used the "tuck" feature of the IWB holsters anyway. And Crossbreed made what I needed to fit with the red dot and tall front sight and made delivery in less than 2 weeks.
I have shot several types of JHP ammo with good results in the P-10C, but still prefer the Atlanta Arms 115 JHP so that is what I'm using for carry as well as bullseye matches (in the P-10F, 75B, and P-09). I shot the P-10C this morning in its carry configuration and am breaking in the new holster this week. The Kahr and P-07 are in the safe for now. Until I need them for another round of annual pistol training for the folks at the office.
Now, back to bullseye practice with the P-10F and Kadet.
Joe