My "all the time" gun today is an S&W 340SC to which I've fitted Crimson Trace lasergrips. Lightweight, reliable, and pretty powerful . . . at both ends.
I used to have a Kahr P9 . . . a more troublesome, unreliable pocket pistol probably hasn't been made. Numerous problems . . . premature slide lock, failure to go into battery, trigger pin walked out, trigger failed to actuate striker . . . after several unsuccessful attempts to fix it under warranty, Kahr threw in the towel and replaced it.
Don't know how the replacement was, since I immediately traded it, unfired, for a Glock 26. The G26 isn't as neat a package, but unlike Kahr's POS9, it actually works.