Compared to a Glock or XD, the trigger is heavy, very heavy. I have two Sigmas and have no complaints. Accurate, Reliable and inexpensive. The grips are nearly perfect (IMHO).
There were some issues with the first Sigma 40's. This was the very first pistol chambered for the "new" S&W 40. The chamber dimensions were too tight on the first series of guns. The .40's with PAA and PAB prefix serial numbers were recalled and rebarrelled at no charge by Smith.
I have no problem trusting my life to my Sigma 40C. It is my daily carry gun. My 9V is my fanny pack gun that is with me daily in my car.
Now all I need is a .357 sig barrel for the 40C. Not because I am enamoured with the sig round. Just "because".