No, never been on a show.
But if you do get on one, please keep a serious face, do your homework, describe the ride elements correctly, stay calm, and then tell the camera you can't wait for something taller in the future.
Producers of coaster shows tell people to whoop it up and get all excited, or scared. Unfortunately, this kind of behavior comes across as plain dumb when you go back and look at it on a video.
I already wrote my letter to Discovery, and they thanked me for writing.
If you do get on the show, ignore what the producers say, they will coach you incorrectly.
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Robin Fox - "I see Stars, Can You See Them Too?"