Thats insane....that stuff has to wear out sometime
My friends have tried talking me into putting a zip line on my property. I have a good spot for one but we tend to drink too much to be doing stuff like that around here.
thats not that different from that space chute thing they have at carowinds (seen one at MB also) only they pulled you down and launched you straight up...
It looks like great fun but I just wasn't convinced that enough engineering was put into it. A couple teenagers with an ATV didn't inspire my confidence.