Rubber Carpet Padding?

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Hi all

Does anyone have experience with using rubber carpet padding? I hear it is better at reducing noise between floors and can also be water proof which is a plus. I am mainly interested if anyone has used it for noise reduction, I've seen some reviews where users claim that the pad flattened out over a few short years; rubber padding costs more and should last longer than typical padding according to what I've read though.

Any advice would be appreciated.