I have installed an Apex trigger kits in both the SD9VE and SD40VE. You should purchase the Apex Polymer SD Action Enhancement Trigger kit and the Apex SD Spring Kit. If you do just the trigger, it will not make much difference in the pull weight, pull length and reset distance. You need the spring kit to go along with the trigger to get the most benefit. I will caution you that while these kits improve the overall trigger performance, but do not expect miracles. They do reduce the trigger weight and reduce some of the pull length to a point where it is better than the factory trigger, but it still is not a great trigger.

I put the apex sear in my M&P, didn't like it. Long uptake and too light trigger.

The Apex SD Polymer Action Enhancement Trigger. Item/model # 107-003 in search window

Apex SD polymer Action Enhancement Trigger.