Looking at what I assume is the site for that one (http://www.harpersferryzipline.com), the main difference looks to be how much lower it was. Their platforms are 65 feet up, our lowest one was 60, highest was 200 feet up. While 60 feet was scary, I think I would have enjoyed it more than the really, really high ones.

And for sure! "Doing crazy shit in a tree" is an amusing thing to be able to cross off my list.