I had to remind myself that "170 ft. will kill you just as dead as 1,700 ft..."
All the movement of that head-mounted camera doesn't help. :-/
Like Fozzer said- don't open one hand unless the other has a firm grip (you also see him glancing often at feet and hands to confirm what they're on), and there's no problem. But two things bother me about this climb: first, an unexpected gust could ruin your day, and second, there are a couple of awkward maneuvers that have to be made while unclipped!!

I might make it all the way up the ladders without soiling myself, but that last bit at the very top just looks scary.