I tried it once and didn't notice any difference in trigger pull after putting it on a gauge a bunch of times. The readings stayed about the same. Never tried it again.
You can certainly cause problems over polishing your trigger parts. I guess the question I have is what are you looking to improve?do you guys polish your trigger? if so does it actually help? Cany you cause problems polshing the trigger?
A couple of hours performing secondary operations is all it needs, and this way you can keep the stock spring or at least a 5 pd. And I see folks putting in the reduced power plunger springs, not necessary.Swap out the factory striker spring for a reduced 4lb one and the glock trigger isn't bad at all. Polishing never seemed to do that much from what I've felt.