I left my 2.0 Compact 40 trigger alone. That's the best trigger S&W has made for the current M&P's.I've been liking my new-ish S&W M&P M2.0 Pro Series CORE quite a bit, even more with the Apex Duty/Carry spring kit installed in it now.
My LE Trade in 1.0 40's all have the APEX spring kits and triggers in them. Those factory triggers are hideous!
I just recently removed my APEX spring kit from my SD9 and installed a Wesbaun SD9 spring kit in it. IMHO, it's 10X better than APEX. I also added a Galloway Boudica trigger in it. She's a real tack driver. I would put it up against ANY G19, any day.