My 2013 2 door JK hinges had started getting harder to remove this last year, and I discovered that the plastic liner in the bushings on *my* doors was little more than a really thick, clear, packing-type tape. I had boogered up the tape on the upper bushing pretty badly on both doors, so they were harder to get installed and swung slower and felt a bit too tight to me. This Spring I went to take them off and had to resort to the floor jack/4x4 scrap to pop it off. I did not suffer any sort of damage to the doors, but I did not like the fact that I had to do this to something so expensive and easy to damage.
I bought a set of these (four bushings + tool) and had them installed in under a half hour with my wife's help. The JK OEM came out with little fuss because they had very little rust or corrosion on them, and the tool helped a lot. Using a socket gives you a much smaller surface to hammer on, which could lead to a miss that dings or scratches your tub, and it is like $5 extra, so why not? And it really did help as it is perfectly sized for the task.
End result: The doors swing like they did before, and they now lift off and reinstall with much less effort. I found that white lithium grease just gummed these up. I cleaned it all out and these seem to work better dry. (Delrin is self-lubricating, so even if your pins rust a bit they should still turn easily and the removal and installation ought to be no problem.)