I had two M&P "LE" guns I bought in 2008. A 40 full size and a 40c. I still have the full size. At that time LE guns were in a black case and non LE's were in a blue case. There were rumors that the LE guns were being cherry picked for better triggers. Of course that caused a lot of arguing and bickering as you can imagine. 
I never paid any attention to it until I bought a Performance Center Pro Series C.O.R.E in 9mm in 2016 to use as a target gun. It's trigger was terrible compared to my LE guns, I had to put an Apex Trigger in it for it to be usable for a target gun.

I never paid any attention to it until I bought a Performance Center Pro Series C.O.R.E in 9mm in 2016 to use as a target gun. It's trigger was terrible compared to my LE guns, I had to put an Apex Trigger in it for it to be usable for a target gun.