This is a recently added attraction at Kirstenbosch Botanical Gardens.
Although it was misty, overcast with a light rain falling it was pretty cool. It was a far shorter walk than I expected.
The walkway was steady for the most part, and they do advice you of movement, but we only felt it about halfway where the walkway is set above the trees and you are suspended in the air. There were only a handful of people on it, including some children who were running up and down, I think if there were more people, it would move a lot more.
The view seems to go on for ever, and it is quite difficult to get photo's as everyone is doing the same thing :) .
There is no extra charge for this as it is included in the entry fee.