I, Jessica Wendel, have ridden the worlds fastest and tallest roller coaster in the world. It is so fun!!!! My mom was to chicken to ride with. We went with another family from our ward, and they have a girl one year older...so I sat with her. Her mom SCREAMED the whole ride. The llink below is a video of it. Not by me of course. Have fun!
http://themeparks.about.com/od/photoandvideogallery/youtube/kingdaYT.htm
Feet in the atmoshere: 458 ft in the atmosephere
Speed: Goes from 0 mph to 128 mph in 3.5 SECONDS!!!