Having owned a CM9 and CW9, the CW is a more enjoyable shooter. I have not fired a Shield. Also keep in mind the CW9's barrel is 1/2" LONGER than the Shield's in a package that's .2" SHORTER! Not to mentiom lighter.

http://www.kahr.com/Pistols/Kahr-CW9.asp

http://www.smith-wesson.com/webapp/w...1_757781_image