@franknog i3 is cool, I agree. I started to learn it a while back because I was testing all the window managers for #inxi, and the one that struck me the most was #i3, so I decided to start using it on one system. I like it, it's an interesting concept in terms of how to interact with a computer. Not for everyone, and not for every application, but it's very interesting.
i also really liked the i3 concepts of how to avoid bloat, and, most important, how critical documentation is for a tool like i3.