Honestly, I wanted a reliable conceal carry weapon. Kahr CW9 fits that bill without fail. It is thin, has an awesome trigger and it more accurate than I am (and I'm not a bad shot).
I didn't want a summer carry and a winter carry, a fall carry and a spring carry. I wanted a reliable weapon I could always carry no matter how I'm dressed. My Kahr is my always weapon.
Glocks are fantastic pistols, no doubt. But to me, they are service guns. If you can carry open then sure Glock it up. I know you can conceal a Glock and many do, but for concealed, you cant beat a Kahr.
As for how many rounds you can carry; If I need more than my two 8 round mags, then I am not defending myself, i am in a combat situation and need to use my ammo to escape asap! Most of us citizens will never even have to use our guns for defense (thank the Lord) and those of us who will, will not typically be in a combat situation.
See my Kahr range report here
http://www.thehighroad.org/showthread.php?t=386277
Now, for home defense I have a Ruger P89 with several 15 round mags full of 147 gn Hornady ready to go along with my Browning A-5 shotgun. If you come into my house, you will be the one facing a combat situation.
I will admit, i do have a "chruch" gun. My Kel-Tec P32 goes to church with me since it is hard to have a larger gun with me then.