I just got my full size 320 back from Sig after the “optional upgrade”. I like the trigger better than it was before. It might be a little heavier but there is just a little take up then a pretty good, defined wall before the break. Overall I’m really liking the gun. I only had it a couple months before I sent it in for the upgrade
IMO the 320 has one of the best triggers from factory on the market. For a striker fired pistol anyway. I also suggest checking out an HK VP9 if you have the chance.