I have the Kahr MK9 which is the same size as the PM9. I absolutely love the gun. It is obviously heavier but it stabilizes the gun. I did not like the feel of the PM9 as well YMMV
i'm the exact opposite, i have a K9, P9 and PM9, bought the K9 when kahr 1st came out, liked the pistol but for me it was just too darned heavy, for me the P9 and PM9 are as close to a perfect edc as i have found, the PM9 is hardly bigger/heavier than a walther PPK, pretty hard to beat imho.
agree ya do have to grind the slide release down a bit but 5 mins on a norton stone takes care of that problem.
a .380 is on the very edge of being big enough for any serious use imho, while the 9MM with good ammo (ie ranger 147 or 127 +P+) will do what ya need it to do, to me a .32 and .380 are so close to one another i i would rather have a little smaller pistol in .32(ie keltec P32) vs a slightly larger one in .380 (KT P3AT) and the difference isnt much, but like i said imho the performance difference between those 2 is pretty small, while the 9MM is a service calibre used by the US military and police depts all over the place and has a lot more oomph than either the 32 or 380.
i also agree the .40 P- series kahrs are a little jumpy and more difficult to shoot well vs the 9MM but i dont have any probs with the P9 or the PM9, a bud has a P40 covert and it is a handfull with hot ammo, in my PM9 i use std pressure ranger 147gr and they arent bad at all, in the larger one i use ranger 127gr +P+ and in that one its not bad, but the +P+ in the PM would be (is)a little different story lol, but even with the +P+ imho the PM9 isnt nearly as hard to shoot well as a S&W "J" frame with +P or +P+ stuff, not to even mention the scandium "J"'s or the scandium .357's, now those are a bear, and i shoot a fair amount of magnums, imho the scandium "J" .357 with 125gr magnum ammo is as unpleasant to shoot as anything i have ever tried to shoot, and i have tried a few lol (ie 44 mag, 454 casull, 500 S&W to name 3).