lofland, i havent tried using the 40 magazines in the 9, i didnt even know there were rumors that this was possible. guess i fail in the creative thought department. i'll see how it loads up tonight.
overall, the m9 is a fine weapon. compared to a glock, its kind of like splitting hairs. both are accurate. both have low felt recoil. both are easy to maintain. both are reliable. the only differences i like is the loaded chamber indicator, and the manual safety.
i've had some issues with the m40, failing to go into battery. and either i have some crappy ammo, since last trip to the range i had a dozen fail to fires. if it isnt the ammo, i think its a weak recoil spring, or even a weak firing pin spring. no one elsei have talked to who own the m40 had problems similar to this, so it could just be an isolated incident.
being a new shooter, i feel a remarkable difference between the 9 and .40, with the 9 having greater controlability in shot placement. the .40 pounds the hell out of my hand, which has been making me flinch more than i'd like to be.
bottom line, i'm happy with my purchase, and would do it again if possible.