You've gotten some excellent feedback here, BUT you didn't tell us WHY you wanted a pistol--home defense, concealed carry, precision bulls-eye competition, IDPA, occasional plinking at tin cans. Makes a difference.
The Sigma is a good fit for some of these applications, for others, not so much.
The heavy and long trigger, isn't a problem (IMHO and advantage) for self-defense applications. It does take some getting used to, but when you do you will find yourself a better shooter. Most people who handle one will comment on the great feel and the "pointability".
I wouldn't recommend it for competition, not because it isn't accurate or reliable (it is) but for the same reason I wouldn't recommend running the family mini-van against the muscle cars on the drag strip, it ain't a race gun and there are no easy ways to make it a race gun. If you are into competition get something that can be easily tweaked such as the M&P. This forum gets a lot of questions on Sigma trigger, grip and sight upgrades, but there isn't much out there, you will be time and money ahead with something like and M&P if you want to compete.
The Sigma is a great gun for the money for self-defense home defense and carry applications. With some practice you will impress your gun nut buddies with the Sigma.