I remember seeing this awhile ago.....as a rock climber myself, I don't think it would be bad as long as you didn't have a heights problem. The part they mention about free climbing is very true and you would be more prone to accident clipping every few feet. I've taken people with little to no experience climbing long routes(over 1000 ft) over the last year. I usually tell them at the rate you gain in height , you won't even notice how high you really are. You become comfortable, simply focus on climbing, and nothing else.