I have VPI [dealer] and TTWeight. They give a quieter background as they damp vibrations that would otherwise be reflected back to the stylus. Vacuum tables do the same thing. In general it is quite worthwhile in my opinion. But not all tables react the same. Two of my friends with Raven tables don't use them, think it makes the sound worse. More trouble to use but not that much. Try if you can and see what you think before buying.
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