I jumped on the bandwagon when it came out because it was more powerful than a 9mm and we were not allowed to carry a 45ACP.
Once the 45 was approved I got one and carried it for a while.
I got sick for an extended period of time and switched to a 9mm for higher capacity and less recoil.
I have one 40, it was an award for Reserve Deputy of the Year the first time so it is unfired in the box.
I have plenty of ammunition and components and I can shoot it in my S&W 610 with full moon clips
When I took the Glock Armorers course the instructor said that 40 destroy themselves.
I have not shot one enough to experience it.
It is a snappy cartridge!