I had a problem with my relatively new pneumatic pistons where the operation was both "sticky" and required a lot of force. I've since then lubricated a lot of pistons with this and now those pistons operate super smoothly, don't dry rot and in general are a pleasure to use. When I say "smoothly" I mean both by hand and via the pneumatic system! If your piston is slightly sticky you might have this experience where you need to pump a lot of air and then suddenly it shoots up/down with a bit too much force. After lubricating it's pretty linear. Pump a little, the piston moves a little. You can even stop midway somewhat easily without having to operate the switch like a surgeon.
Pros: operates super smoothly, don't dry rot
Cons: operation was "sticky"