They do give you a bit of grief, but as VS stated works fantastic whilst under water. IF you look at wharfs around the world that utilise the technology, the part of the pole that stays submerged looks fantastic,
the part's of the pole that come in and out with the tide not so good.
I Had a work vehicle GLXR Triton a few years back that had the electronic rust protection installed & I started getting rust on where the front nudge bar attached to the car, they did come good on it but as it was done by the dealer not sure weather the rust company or the dealership took the hit. But always worth asking the question
Good luck...
Life is what happens while you are busy making plans........