I have been carrying a S&W 642 in an Uncle Mike's pocket holster for several years. However, yesterday I picked up a Kahr PM9, and just returned from the range after firing 210 rounds of assorted 9mm ammo. Kahr states in the manual that you shouldn't depend on it until firing at least 200 rounds.
The little Kahr handled everything I loaded into it, and I had one FTF of a handloaded hollow point at around round 150 (possibly this one was a bit long in the case). I fired it weak hand, strong hand, two hand, and even intentionally "limp wristed" it a couple of times. I fired it with both standard and +P ammo. Recoil wasn't as bad as I anticipated, but I did work up a blister on the thumb of my strong hand. I wasn't trying for accuracy, shooting whenever the front sight was on the IPSC target at 7 yards, but it appeared to keep all the rounds in the kill zone.
The Kahr fits in the same pocket holster as the 642, and one advantage is that I will carry a reload, since the spare mag fits in a black nylon knife holster, and nobody knows that it isn't a small folder on my belt. I never did find a good way to carry spares for the 642, since speed loaders are too bulky, and speed strips don't co-exist with the keys, change, etc. that reside in the non-gun front pocket.
The Kahr is presently loaded with Cor-bon 115 +P, and I feel pretty happy with 7 of those in the pistol and an additional 7 of them in the spare mag.