I don't. But now that you've mentioned it I could see it being really nice for fine rooted orchids. A lot of people I know use it in their aquariums, I thought about it but went another direction. From what I know researching it from that point of view it should be a rather quick to dry should hold humidity for a long time. My biggest 2 concerns would be not enough air space between the particles and the fact that it's a fairly heavy medium (like sand) which might spell trouble for delicate roots. If you try it try it on one orchid to see how it works and please keep us posted.
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