I just got it installed. Easy process, but mine was one of the 10% that required fitting. 5 minutes with a stone, and some Cold Blue from Brownell's and it went right in.
All I can say is wow. The reset is awesome. I'll never short-stroke the trigger again, but beyond that.... it actually really improves the smoothness of the DA pull.
I can confirm that the firing pin block will not reactivate until you reset the trigger.