The fact that the Shield in 45 ACP is pretty much the same height as a Glock 19 and only about a half an inch shorter was the reason I put off buying one when they first came out. For me, the biggest dimension that makes a difference for carrying is the overall height and since that is pretty much a wash I figured having sixteen rounds on tap gave me a warmer, fuzzier feeling than seven rounds in the Shield. The $75 rebate on the Shield was what swung me over to actually purchasing one.