Got the Sprinco trigger and safety springs for my Canik and PDP . Did the Canik in less than 10 min, with no problem.  Trigger spring on the Walther was a breeze ,But you have to take off the top plate /RDS mounting plate to get the safety plunger out .I have an RDS mounted on it and would prefer to not remove it. I have the gen 1 mounting plate and it is on there nice and tight and secure ,and don't want to remove it if I don't have to . So what I  want to know is ,is there a worthwhile significant improvement on trigger pull and feel after changing the safety plunger spring ?  I do plan on getting the Walther Dynamic trigger in the future.  

I just bought a PDP today, the stock tigger is crazy good. Why mess with it at all?

While it is good ,it could be better. And with the new trigger spring it has made it a bit better. In the end I plan on installing the Walther Dynamic trigger . If your happy and satisficed with the stock "good enough" trigger pull then you need not modify . Sprinco sells the springs because there is a need/market for them .There is a reason Walther makes and sells the upgraded Dynamic trigger for those of us that want it to be better. Some of us who shoot and have quality 1911's know how nice a pistol with a great trigger is and want our striker fired pistols to have better feeling triggers . In the end ,it's like a stock car and a modified car . Some of us enjoy and appreciate the added performance .

The trigger on my PDP is  not that  great.!
I did put a lighter safety  spring (Ghost/Glock) in a Canik and it did make the trigger smoother .

I get it, I have aftermarket triggers in all of my ARs and some pistols, but the trigger in my PDP is crisp and about 3.5 lbs. It's an early one and I wouldn't want a carry gun with a lighter trigger.
In fact I'm not sure spending more money on their performance trigger could improve on this. My PDP marked 2023 isn't as great but it has zero rounds so far.

I have both Sprinco springs and the PDT trigger on my PDP PRO SD.  Yes, the safety plunger spring made a noticeable difference.  The combination is scary light.  I would not run it in this gun for anything other than gun games and range time.

I have the FCD mounting plate on my gun.  I suffered no loss/appreciable change in zero from dismounting and remounting the optic.