IMO, ALL of my friends are die hard glock fans, even my own brother, but my sd40 can hold its own. i believe that the trigger pull of the "SD" fits the description. Self Defense. Apex makes a trigger kit for it that makes it WAY better if you compare the trigger to a glock, and you still come cheaper than a glock. difference in the two to me is looks, handle, trigger, roll pin on the trigger and what else? interchangeable parts? i have 4 sd40 mags and 8 sigma mags and they ALL feed well. from personal experience, my buddies and i went to the range and all shot together, glock 17 gen4, glock 19 gen3, exp glock 23 gen 3, glock 26 3rd gen, glock 22c 3rd gen, and glock 30. after 500 rounds of remington UMC (dirty dirty dirty ammo imo) the glocks started to FTF, and my sd40 and m&p40 didnt have ANY problems.