I also have the Serpa and I love it for range carry for my 1911, and will probably get one for my 92sf, if I can ever quit buying Mosins long enough to finance one. I like both the retention and the release. It was so well thought out, that when you release the button, your trigger finger lays right along the receiver, where it is supposed to be, as the gun is drawn.
I can't see using one for concealed carry as they are a tad bulky.
"It is better to be too skeptical then too credulous"