Go Ape has been here for a year. Last year (2013 when they opened), I ended up going 4 times with different sets of friends and family. We had a good mix of people, some adventurous, some afraid of heights, and some not quite as physically fit as others. Every person that I went with had an absolute great time - even those "afraid of heights." Don't be scared or intimidated at all, the instructors are great and teach you what you need to know before you get out on your own. They are all very knowledgeable and go out of their way to make sure everyone is comfortable and confident.
The harnesses hold well and you do feel safe throughout. The trees flex, as trees do, but any time you are off the ground at all you are connected to a safety wire to minimize any potential of an accident.
My suggestion is to make an appointment and go even if you don't feel it may be right for you. They let you go through the hands-on safety coarse before deciding if you'd rather sit it out and get a refund but go with an open mind, you might just surprise yourself with how much fun it is!