My daughter and I just returned from Catalina and our first zip line experience; it was just terrific. Both of us are afraid of heights, but by the time I was fastened in the equipment and the entire procedure was explained, the only fear I had was stepping into nothing on the first platform. After the first time, it got much easier to do. The ride is amazing and there is no strain on any part of your body, just a fast and exciting ride. By the way, I am 71 years old and I'm not in great shape at all, so the "no strain on the body" was especially important to me.
The men who assisted our group of 8 people were Jake and Christian. They were so upbeat and fun to be with, and were trememdously dedicated to the protection of the Eco system on Catalina. If you can chose your team, I highly recommend them.
One last thing, At first I thought the cost was a little high, but after the whole experience, I consider it a real bargain. Happy Zipping on Catalina.