I have a Kahr CW9, and a new M&P 9c. I have not shot the M&P yet as I got it yesterday.
As far as the Kahr, I have put 500 rounds through it so far, from the first to the last they were all flawless. My groups were excellent. I would carry the Kahr anywhere and not worry about reliability.
If you do get one make sure you break it in really good...around 200 - 400 rounds the slide is really, really, tight...which I like, means it was machined properly.
I also have the KelTec P3AT which I use to carry on hot days, it has now been replaced by my Karh.
The others I carry occasionally, and mostly in the winter, or when I have to drive into Memphis...SIG P239 .40, Glock 19.
All in all I don't think you will go wrong if you decide on the Kahr..they are small, and super dependable...they like to be oiled, and broke in, if you remember that, it will reward you with years of excellent service.
Of course this is all IMHO...of which everyone has.