Not a deal breaker but Xmonad brings a large dependency (1GB+ is the price of Haskell) where most TWMs on Linux are in comparison laughably lightweight and blazing fast.<p>For me i3 strikes the sweetspot of dead simple config, incredible feature set, and performance. This after coming from Awesome WM where I found myself spending way too much time tweaking Lua script to get things pixel perfect, which you basically get out of the box for free with i3.