I had such a blast! They really make you feel safe. There's multiple weigh-ins, numerous people doing safety checks on the harnesses and it seems really well run and professional. It is basically a vertical zipline, but you're on the 107th floor so it's not a little fall. The entire thing lasts about 17 seconds and you free fall for somewhere around 5, maybe less, until the "zip line" system kicks in and then you're pretty much floating. It cost $120 (without the GoPro or pics) which was fine with me. I had friends at the bottom recording and they give you a certificate for half off if you ever want to do it again. As everyone said, the jump is the hardest part - just step off the ledge and the rest is easy.