There was an organized smear campaign against S&W, and the Sigma was one of the biggest targets. Don't believe all the thrash talk you hear about "some police department tested them, and they fell apart".
I have 4 of them, one in each caliber (380, 9, 40 & 357). They all function great, and 380 excluded, will outshoot all my Glocks except the G20 at 25 yards. Even the 380 is accurate, but 25 yards is stretching it. I actually like the trigger on the Sigma, it has a long, but smooth pull, and when it breaks, it breaks very smooth. It feels better than any other pistol in my hand, I just wish they made a compact model I can put a decent set of night sets on similar to a G26/27.