I had an S&W SW40, otherwise known as a Sigma. It was an OK gun but it had a hellacious trigger pull. It was slightly smaller than a Service model XD but had a 14 round mag rather than a 12 round like the XD. I shot it well but did not like the trigger as much as about any other non-Glock pistol I've owned. My wife found the grip to be much more to her liking than most of my other auto pistols though. It went down the road shortly after I bought my first XD. I am an XD fan as it fits my hand very well. I've had all three models in 40 S&W but currently own just a Service. The Tactical was too difficult to get a holster for while the grip on the SC was really not any smaller than the Service if the finger extension was used and carried 3 fewer rounds. If you put a flat floor plate on to make the grip shorter, a finger and a half were left out in the wind which does not greatly aid accuracy. The inch or so difference in barrel length is virtually unnoticable for belt carry with the longer barrel having a few noticable benefits.