Ranger,
I would say that by default, that yes, it improves the accuracy of the guns. You are not fighting the trigger to make it go boom. No longer pulling, and pulling, and wondering is it ever going to go off and then you yank the trigger to just get it over with. The trigger feels more like a decent/good trigger should feel like. Of course your confidence goes up when you actually hit what you are aiming at instead of yanking/jerking the trigger and pulling the shot.
Everyone who feels the triggers on our Apex guns can't believe how great they feel. Crisp break, no take up (with the FSS kit). On our carry guns I put the Apex DCAEK kits in and also an Apex polymer trigger. The trigger reduces the pre travel by about 30%. I put the triggers in because I do not like how the stock trigger physically feels. Hope this helps.