The trigger on my P14 is the stock military one, but it's been polished up and made to work very nicely. I think I'll leave it as is, but I'll try a Timney on my M17 and a DT on my other P14. I'll post later what I've found to work nicer, smoother, etc. etc.. and so on.
I'm from the school where if it's not broke, why fix it? But then, I love tuning the toys I have.