The XDs pistol is a thin, comfortable pistol to carry. I know an instructor who carries and uses the .45 version of the XDs and he loves it. It has become his favorite off duty carry pistol. This instructor used to be an instructor for the Illinois State Police. I prefer my 9 mm version for various tasks that I'm doing. I love my 9 mm variant because it is just so comfortable to wear and carry. The other thing that I really like about 9 mm is how extremely accurate it has proven to be. For a small pistol, the XDs has proven to be more accurate than other small, more compact pistols that I've tested and shot. You can't go wrong with a XDs pistol no matter which caliber you opt to use.