If you want to try some you need to request it in your post, tell people where you are based and what you weigh and if anyone is near by they may be kind enough to let you try provided you are of similar weight.
Pro-Jump 101 (our display team) are based near Portsmoth if you are near there then I'm sure they would let you try!
There is 1 company that actually rent out PoweriZers (Made by same manufacturer, exact same product as Pro-Jump, but with different name and more expensive!) who are based in cornwall if you can get up there they have a shop caller HIRERISERS
Hope this helps