I have 2 P-09's, a .40 cal that is bone stock except for the hammer spring, I switched that out to an 11.5 lb spring, Ive polished up the internals a little and did the slight bend of the trigger bar spring, and then shot the snot out of it. It is extremely smooth, DA trigger pull is very light, I dont have a gauge but I would imagine its about 5 lbs max. Single action is light, but a little mushy with the stock hammer. It pops all primers with no problem.
I also have a 9mm that has the cajun race hammer, a 13lb hammer spring (it would not work with the 11.5), and lightly polished internals. I tried the short reset kit and oversized roller but saw no improvement with either over the stock parts. There is a very noticeable difference between the two SA trigger breaks, the cajun hammer is much more crisp.
Otherwise, the two triggers are very smooth and plenty light in DA. I would definitely polish it up and shoot it a lot. Unless the production legal hammer can get the break as crisp as the race hammer I dont see a reason to change it.