The problem is that we'll get people using this in a primary role on their sites/apps because it's novel and people love using novel things. In order to have that "fun" look, you have to have a pretty long animation duration (currently ~3 seconds until they stop moving), which is doing users a disservice by making them wait until they can use the navigation let alone start reading the contents of the list.

It's a neat demo, I just fear what developers will do with it.