Got my spring kits today for my XDS 9 4.0 and 45 3.3, First set took about 40 minutes to do second kit took about 15 minutes(learned what was up on the first go around making it a breeze). I think these were just what these guns needed. the triggers are so much smoother and lighter to pull now, giddy to get to range tomorrow as I see better groups coming in these gun for sure. dry fired several times and can now hold on target much better now with improved triggers. A lot of folks say they think the stock triggers are fine apparently because they have not messed with one with these springs installed...AWSOME UPGRADE for these guns!!