One of the main reasons why I did the OP is due to a couple of my buddies and their comments, similar to: If it doesn't "fit" you, you won't be apt to carry it. And if you don't carry it, it's absolutely useless when you need it. This is why I've asked about the difference in single and double stacks, specifically. Thanks for your input! I actually had a CM9 in my hand yesterday, and it seemed very nice, so I can imagine that the PM9 is pretty slick.