That looks like fun. Did that once in a more controlled setting (Canada's Wonderland) and probably not as high, but height only matters until you reach the death height, anything higher will just spread you farther and make a bigger crater.

I would have done it over and over if it was not like $65 a pop. My friend was too chicken to join me so I had to go alone.
Their setup looks very safe, I'd totally do that if given the chance. Free falling is the most awesome feeling ever. Even if something goes wrong, it's just the landing that's not particularly as fun.