That was soem good info in that link, i did think the XDM9 was a tad larger than it appears to be, yet i wouldnt consider the SIG 229 which its "similar" to, to be a very good ccw gun either. a SIG 229 is almost the exact size of a P95, and while both are concealable (i did so for a long time), theres no comparison between them and a thin grip 1911 (or an SR9)
so it doesnt really change my original opinion, just enforces it, i wouldnt buy an XDM if i inteded to carry the same way that i wouldnt a SIG 229 or a P95 for that matter, possible yes, comfortable for most, not really. You can conceal a MAC-10 with wide enough pants and a really good holster...
Switching from the P95 to the sr9 was a HUGE difference, when he says that the xdm is only "slightly" larger, that slightly, 0.1 or 0.2 inches makes a BIG difference to me. I used to think the P95/Sig229 was a piece of cake to conceal, untill i tried something thinner