We considered going when we were on the island at the beginning of the month. We have heard raves about it. The zip line extreme is not for the faint of heart or those out of shape. Here is a detailed video I saw on You Tube that show just how grueling this zip line is.
https://youtu.be/UkOX-FKgQzA <img src="http://www.traveltalkonline.com/forums/images/graemlins/Yikes.gif" alt="" /> <img src="http://www.traveltalkonline.com/forums/images/graemlins/Yikes.gif" alt="" />