I had the drop in trigger bar in my Sr9c before I sent it in for warranty work after I got it back the trigger was so much smother than before I sent it in that I never bothered to re install it.
I don't remember it being a whoa this is great difference when it was installed,the better kit that requires custom fitting may yield better results though.
I have thought about getting thier"smooth it" parts and re installing my trigger bar but I am lazy so its on the back burner.
timboy - yes I see the Ultimate which is drop in has cause some frustration and does always go in as hoped..the Rocket says it needs gunsmithing and then I saw the smooth it kit too... and wondering about the gunsmithed one as well. as thats really all I want is the trigger a bit smoother and good release of trigger vs really have it "Lighter". so now debating that all as well.
I installed a Ghost ultimate trigger from Galloway in my SR9C about 5 years ago it lightened y trigger a little, right at 3 lbs, however it eliminated a slight staging, now the trigger is smooth with a surprise let off, several people I have let fire my pistol have all commented very favorably about the trigger.