The interface is very discoverable, unlike screen or tmux. You can start using it productively even before reading any documentation. The keybindings feel like a cross between vim (modal) bindings and CUA bindings.
One thing that is a bit weird still is that the displayed keybindings doesn't reflect your configuration, so if you use an alternative config you'll see the wrong bindings for some thing all the time.
I though that but I just installed the latest version and it does change the displayed keybindings
Fortunately that is now fixed in the 0.31.0 release two weeks ago!