Well I did get to spend a good deal of time examining these 2 new models in person today at the S&W booth at the NRA Conv. in Charlotte. After carefully going over these 2 guns I can honestly say that it is a very marginal upgrade over the current Sigma. There is no gritty feeling with the trigger at all. The trigger doesn't feel any lighter than a Sigma. The main difference in the mags is the color, the new ones look to be melonite coated, beyond that, they appear to be an exact copy of the Sigma mags. The SD's really did come across as a low level M&P clone. I love S&W but this new offering is not a huge upgrade over the Sigma.