The old Sigmas had a well deserved reputation as a garbage pistol.....they were.
The current models are fine for defensive use. Its no match gun but it was never meant to be. I owned one a few years ago. I bought it from a co worker in need of money for $200. I too hated the trigger. But fear not for there is a fix for that which can improve trigger pull by leaps and bounds.
There was a thread over on the Smith&Wesson forum with step by step instructions on how to "fluff and buff" the trigger assembly. I can't find it right now but look around its out there. You can also add Wold striker springs to greatly improve the trigger.
Wolff GunSprings Home Page
Mine ran like a sewing machine. Not surprising seeing as how its a copy of a Glock. So much so that Glock filed suit against S&W and won. Spare mags are pricey however. All in all its a decent choice for a SD gun on a budget. Its no HK, Glock or Sig but its lightyears ahead of say a Highpoint.