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i have one and personally i think they are 10 times bouncier than regular spring trampolines. on a regular spring tramp the springs ony allow you to reach a certian hight, they basiclly limit your trickability. i have one foot extentions on my tramps supports and they increase my jumping ability by a great deal. i highly recomend this tramp, it is relly worth it. but to answer your question you can easily do 900s.