I have a circa 2012 m&p pro9 that I did like the trigger on. I shot it that way for a season before putting in an Apex comp kit. I believe the pro trigger broke at around 4 pounds she I pulled it out. When I swapped in the Apex kit it really was not an improvement until it broke it. Now the Apex kit breaks cleanly with less than a three pound pull, I am very happy with it.
Now back to the pro trigger. I placed the pro trigger group into my m&p 9c and I am quite happy with it in there as a carry trigger. I would say in the 9c it breaks at nearly five pounds and it rather crisp. I plan on shooting an IDPA match with it later today. The pro trigger really improved that gun.