The Zipline Eco Tour in Catalina Island is the BEST!!! This was my first time ziplining and the instructors (Kevin and Michael) were great. Within minutes of meeting them, I was made to feel confident and relaxed that this would be the best experience.....and it was!!! The course if beautiful and they each explained all the safety precautions that they take (usually going above and beyond what is regulated!). Both Kevin and Michael shared fun stories of Catalina Island, their lives and their love for ziplining. These guys were great and wonderful 'eye candy'...both had wonderful personalities and are a positive reflection of the tour agency.
The cost of the tour was not cheap, but you definately get your money's worth. It's something everyone should do at least once in their lives. And if possible...do it in a paradise setting like Catalina!