I've got a Kahr PM9. The little pistol is easy to carry/conceal, digests all ammo with ease and is remarkably easy to shoot.
I have many friends that own "carry guns" but leave them home because they are heavy, bulky or just a P-I-T-A to carry. A small, light gun is far more likely to be carried often. That makes the compact Kahr PM series pistols big guns in the world of self protection.