I have a Glock 17 and a Sigma in .40 S&W and much prefer the trigger on the Glock. The hinged trigger on the Sigma just feels odd to me. Functions fine with a heavier pull.
I have fired a Sigma .40 and my Glock 23 back to back. The Sigma just wasn't as accurate and even the guns owner was better with my G-23. The trigger wasn't to bad on the Sigma. Little on the heavy side. I think they are pretty decent guns and nearly every used one I have seen the price was right. They seem to be a good, low-priced, defense gun. My .02