Eden and Jinelle were our guides for our first Zipline experience. They were very warm and friendly, and very knowledgeable. My 9 and 12 year old kids had an absolute blast and i felt very comfortable with them in our guides' expertise.
We went through 8 different lines, starting from the "preschool" line to get us warmed up, to the longest one at almost half a mile long and exceeding 50+ mph! We were also able to go down the lines in various ways, from cruising ( I'm guessing this is the traditional way), to hands free, to "Kauai flyer" (like Superman style), and even upside down!
My whole family had such a great time, we'll probably come back and do it again the next time we're on the island.