Just got it today, decided on the .45 XD instead of the .40Cal XDm, a little cheaper and came with Trijicon night sights! ( all for $485 out the door)
Here is my contribution. My wife's Smith and Wesson SW40C .40 (was her dad's service pistol when he was police chief) and my Taurus subcompact PT745 Pro .45. I recently got rid of my Olympic Arms M4 due to the fact that there is no range nearby that I can really shoot it at.
It was helpful though, on a lot of my missions I didn't carry a rifle, just a shotgun while riding with an M9...and when we took fire...the extra rounds in the 9mm compared to the 45 helped. Obviously not for stopping power but for putting down some occasional cover fire (I know, with a pistol that sucks...but when the Afghan soldiers are hiding in a ditch afraid there isn't a lot of options and fortunately I never had any dead US soldiers while on patrol to get M16s off of).
Me in Afghanistan...I tried to dress down on most of my missions hence why I didn't have too much weaponry.
I'm sure you will be fine now, this was more of an issue with their older models. Grats on the new purchase!