I'm looking into buying a XD(M) .40 as a graduation/commissioning gift for myself and wanted to know if any of you have any yeas or nays about it, thanks!
http://www.the-m-factor.com/
I cannot speak to the XD, wrt ergonomics, reliability, ease of carry etc..
If you can rent one or borrow one, shoot it and see if you like it.
I just picked up a S&W M&P in .357 Sig and am very happy with it. Ergonomics alone make it a sweet wep to shoot.
I believe the .40 S&W and .357 Sig are both excellent calibers. An added bonus, which has been discussed here, is interchangeability. For under 150 duckets you can buy a drop in barrel for either one and shoot both calibers out of the same pistol.