I took a look at the website a couple of days ago, and quite frankly, it didn't look worth it to me. I don't know exactly how the prices compare to if you purchased tickets/hotels/transportation all on your own, but I'd think you could do better. For example, if you bought a season pass for Six Flags, you could tour through Texas and hit others if you're so inclined to drive that far, probably for a bit better price.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/