Just curious on whether people thing using greasable shackle and spring pins is worth the effort/money?

I've got em because I was replacing my shackles and spring pins anyways and there was almost no difference in price.

My hope is they will help the rubber bushings :p

i bought them and a week later i could not get them to take grease...

I run them for the same reason although at times the rear/bottoms break but its an easy fix....