The CS9 was and is an excellent gun. I believe there are compromises made when it comes to sub-compacts and a lot of easy to carry guns sacrifice functionality for size. The CS9 is not one of them.

I am not sure when they stopped making it but the why involves the almighty dollar. Higher production cost and slow sales. It's cheaper and easier to make polymer frames and the CS9 came out just as industry started mass producing plastic wonder guns. I believe the fat Hogue grip didn't help either. I remember many people in the gun shop complaining that the grip was as wide a Glock 26 but held fewer rounds. Of course Big Dog has fixed that with his grips. Something S&W should have done right out of the gate.