Not to the GP, but in '96 I was among the employees at Cedar Point that got to ride Mantis before opening day. Granted, we got stuck on the block break and we sat there for nearly 1/2 hour, and everyone but the first 3 rows (I was in the second row) was walked off, and we didn't think we were going to make it through the corkscrew after releasing, but hey! Still fun, and the best getting stuck on a coaster I've ever had.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html