SkyJump is exactly what it sounds like :) You jump off the Stratosphere attached to a wiring harness connected to your back (not your feet, like bungee.)
It was okay--just not worth the $125+ that I paid to do it, although the extra cost was because I opted to carry a hand-held camcorder on my jump. (I don't recommend it, it was kind of distracting to hold it.)
The jump suit was a little snug in an awkward area, but other than that, it was fine. You are attached to your wire in a glassed room where you can see the other people cheering you on, then you step out onto the platform. The wind is a little nuts at the top of the Tower, so be careful as you step out (don't want to fall haha!)
Normally, I try to do a wacky jump doing bungee and the like, but the camcorder made that difficult. I stepped off the platform and whizzed down. The best part is always the initial sensation of jumping into nothingness!
The wire slows you down and you get to land upright on your feet. So feel free to do some air-ballet on your final few feet of descent. Your friends waiting in the spectator section at the bottom will appreciate it.
Check it out! If you're afraid to dangle by your feet doing bungee but want to do something like it, this is a great way to introduce yourself to it.