Ok so I have had my XDm 4.5 45acp for about 3.5 years or so and honesty I love it. It shoots awesome and I have never had a problem with it. That being said I am always thinking of getting rid of it in favor of an Xdm in 40s&w. Here's my reasoning. Obviously I like my 45 a lot but for one it's really expensive to shoot. When I first got it 45 was "expesive" at $15 a box and like all ammo it's gone way up. The other main reason is its capacity. Yes 13 rounds of 45 is a lot of 45 but it's not as much as 16 rounds of 40s&w. I have contemplated getting a 40s&w as well and having both but with the cheaper ammo and higher capacity as well as being able to convert to and shoot 9mm even cheaper I highly doubt I would ever use my 45 at all. What are you thoughts out there? Obviously 45acp packs a bigger punch but 40s&w is no slouch. 13 rounds is quite a few but 16 is 3 more. Thanks for input.