I read a post on twistypuzzles where a member managed to solve it. He said it took a "long time" to solve it. Judging by his post it looks like a very hard puzzle.
Yes, it was very hard. I've solved it a few more times since then, and it's gotten easier. But no way can I solve it as fast as in that youtube video. I wonder which of us was the first one to solve it? Until I saw that, as far as I knew, nobody else had solved it. Mr. Okamoto, who invented it, said he had no idea how to solve it.