At the moment my trigger experience is about 8-10 lbs on start, then once over the hump, pull a little more easier and it fires. Then it does the same on next shot.

I assume with the kit, initial pulll will be lighter as it goes over the hump, but what will final step be like, much more sensitive?

Would I then get a click indicating I'm set?

IMHO, the kit for the SD does not turn the SD trigger into the M&P 2.0 trigger. Suggest you call APEX and discuss your expectations.

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Science plus Art

I removed the APEX spring kit from my SD9 and installed the Wesbaun SD/SDVE spring kit. IMHO, it's 10X better than the APEX kit.
My trigger pull weight is almost 5 lbs. I have shot almost 300 rds. and no problems.
S&W SD VE Trigger Spring Kit for Smith & Wesson SD9 SD40 SD9VE SD40VE 107-120 - Wesbaun Gun Springs

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How many guns are too many?

Have any of you experienced light primer strikes or any malfunctions when using apex or other trigger kits in the sd series pistols? I have not installed any in mine. I cut my teeth on revolvers so the rolling heavy trigger doesn’t bother me really. I was just curios about using lighter than stock striker springs and light primer strikes occurring.

I have installed the Apex spring kit into 4 different SD9VE pistols. One of them had light primer strikes. So I replaced just the Apex striker spring back to the factory spring and all is well.

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NRA Life Member, Patron

You might have to file the back of the Apex trigger to get it to fire properly. Watch the video and they warn you about that. I had to file mine. I also bought the galloway boudica trigger and I prefer the boudica to the Apex. ( I also had to file and trim the boudica trigger.) I did get light strikes and failure to fire with the apex striker spring and switched back to the original until I bought the galloway trigger. Both kits are an improvement over the original if you don't like the heavy trigger pull.