It's absolutely horrid. Lets say you want to read everything: first you need to experiment whether depth-first search is going down or right. Then you miss stuf

It's absolutely horrid. Lets say you want to read everything: first you need to experiment whether depth-first search is going down or right. Then you miss stuff because the down and up buttons on some screens use a lighter shade than what you're expecting that is very close to the "nothing here" shade; after figuring this out you go back to examine everything you saw because you might've missed something based on this mysterious hard-to-distinguish shade. Eventually I gave up, maybe he has interesting stuff to say further on but I'll never know because I was defeated by terrible UI patterns. Prime example of sacrificing usability for looks.