As an XD-40 service model owner, 16 rds. in a service sized 40S&W pistol is amazing. It's a cool selling point, i.e. more is better, but practically speaking I feel pretty good about having even just 12 rds. available.
The match grade barrel is impressive too, yet again - the standard XD series are known to shoot quite accurately.
When I first saw your picture, because of the grip style, I thought it might be a Walther!
Overall the XD-M impresses me more as a competitive pistol than a defensive weapon. Kind of like the difference between a mid-priced 1911 and a high end 1911 outfitted with the goodies to give an expert shooter an edge in say, IDPA.