Fast, well documented, easy to learn and configure.
I was skeptical at first of how well a tiling window manager would work, but decided to give it a try (with a base Debian MATE environment), and it has worked surprisingly well, allowed for every customization that I've needed, and has greatly improved the speed of my workflow. Color me impressed!
It's the best tiling window manager for my needs. Great documentation. Great config file syntax. Great performance.
Our users have written 4 comments and reviews about i3, and it has gotten 58 likes