I've got a Kel-Tec P11 that I use for backup, or regular carry when I'm in a lightweight mood(most of the time in the Phoenix summer). I've only had it a little while now, but I'm VERY comfortable with it. It's surprisingly accurate, very reliable, [b]S&W 59 series mags will interchange freely(15 round)[/b], and it's probably the lightest 9mm available for its size.
I use the Kel-Tec beltclip that mounts to the right side of the frame, and the pistol tucks away unobtrusively in the small of my back.
The double action only trigger does feel a little long, but I got used to it quickly.
The only complaint I have is that I wish it would have come with a stainless barrel. Mine has started to show a little surface rust after a while, from my body's moisture while carrying inside the rear of my waistband.
I'm having the barrel and the slide coated and refinished in OD green by [b]AZEX Arms[/b] in Flagstaff, though, so it won't be an issue.[:)]
Edited because I forgot to mention that this pistol cost me less than $230. A great deal in my opinion.