I opted for the CM9. I own and carry more expensive guns, partially because I liked certain ascetics and options that cost extra. However, I viewed the CM9 strictly as a tool and didn't see enough reason to pay extra for the PM.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.