I havn't but the have inverted risers for carpet that Intuative design, (a speaker manufacturer that uses Still Points) says works well. If you call them they are rather helpfull.
They work very well and are worth the money. A cheap version that is not as good would be the Star Points formerly known as Audio Points. The only thing I have heard better than the Still Points is the Viberplain but those are over 10K each. :-(
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