I own and have shot my CS9 quite a bit. Mine has been flawless as far as function, no jams etc.
My only real issue is the sights. Mine shoots low, about 6" at 50'. Also, I would like to put night sights on it, but the only ones made are the expensive Trijicons.
I do carry it a lot, it is about as light and small all metal gun as you can get.
Also, there are hardly any aftermarket grips available, (Big Dog only I believe)