My Kahr PM9 broke (frame cracked). Gone!
My friend's Keltec P11 had a terrible trigger and was unreliable....gone!
The P3AT was unreliable...gone!
I have no experience with the others. For guns that small, you may want to stick with the old standbys: S&W J-frame revolvers or the Glock 26 (ok, not so old).
For CCW, I prefer larger guns like the regular frame Glocks, S&W N-Frames with Ahrends Tactical Stocks, Browning Hi-Power, or a Sig.
It's all in the gear. A holster with proper forward cant can easily facilitate the concealment of a large handgun.