As a former Sigma owner, I will say that the Sigma is a very good gun.
Yes, the trigger pull is hard but, that is about the only complaint you will hear about this gun, trust me, if you have ever shot a double action revolver, you can get used to the Sigma's trigger pull.
I traded my Sigma for a Springfield Loaded 1911, I wouldn't have got rid of it otherwise.
Would I ever buy another Sigma? You bet your a$$ I would! Even though the 1911 I traded for is worth a good bit more than a Sigma, I do miss it and will eventually get another.