I have used a Glock 37 for some time. I have Glocks in other calibers as well a several 1911's. I hand load everything. I find that the 45 Gap is inheritly accurate, and will equal the 45 ACP in every way balllistically. The Glock 37 holds 10 + 1 ammo, is easy to maintain, has the worlds best finish, most of all , is dependable. What is it not to like. The Glock has a shorter trigger reset than the XD, as well as less mussle flip because the barrel sets lower to your hand. Shop around and you will find that factory ammo cost close to the 45 ACP. My reloads cost the same as 45 ACP. The construction of the 45 GAP case is thicker in the web area where kabooms occur, and the pressure rating is camparible to a 45 ACP + P . But the case is strong and I have been told that it has been tested to much higher levels. It is a comparitive low pressure round when compared to the 9mm, 40 S&W,or 357 sig. I shoot lots of 9 mm, 40 S&W, 357 sig as well as 44 mag, 357 mag. 38's etc. The size of the Glock 45 GaP pistol is the same size as Glock 9 mm. What is there not to like? {A 45 is better than a 9mm anyday}