wildcard stated the #1 reason which is price and throw in rebates which S&W have been running for quite some time(initially $50+2 mags, to either or) is what pushes people to decide for the Sigma. Ergonomics play a large role in why one purchases a handgun as well, with reliability, function, and customer service as others. I wonder what the % of people who buy a Sigma for their 1st handgun vs as an additional gun to have at a great price. Just from what I have experienced on the forums it seems to be close to 50/50 as to the first purchase vs the additional purchase which says a lot of the confidence people have/percieve with what a lot of Glock owners fee like is an inferior handgun in all respects. I have owned a Sigma and would not hesitate to buy or recommend one to any friend or relative. zorro49