I have riden both Stealth and X-Flight and X-Flight is better. There is more "flying" time on X-Flight. It pulls a lot of G's through the loop and helix. Because you are lying down facing the ground most of the time, you really don't notice negative G's in the in-line twists, but that's the best part of the ride. It was definately running faster Tuesday than last Thursday and Friday.
joey isch is right, if you want to marathon ride it, you better be in shape. I rode it eight times last Thursday for the commercial shoot and 11 times on Tuesday for Media Day (along with 5 laps on BKF and 1 on Serial Thriller) and my legs still felt like jello yesterday. Plus I have bruises under my left arm (if you have wide shoulders, this shouldn't happen, I'm only 5'4" and weigh 115 lbs.)
It is intense and a totally different feeling and even though it's hard to this the first time you ride, let yourself relax into the restraints. It's much more enjoyable and that's what this is all about. The more you ride it, the more you like it.
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Thank you for riding America's Roller Coast