I love these things. I've always wanted to build 2 rideable ones. One version that has many many small legs and I sit on it like a chair. The other would be a replica of his giant one that you get a glimpse of in that video.
Years ago I discovered Theo Jansen and saw several videos which included footage of them "dying" as they fell apart or got stuck on things.
He believes in evolving his designs, so he takes tem out and lets them fail. He'll release several at a time with different aspects and only continue to use the aspects of the ones that live longest. It is pretty interesting.