I like it. It is really good for working with multiple windows without
having to switch between them. Lately I've used Trisquel and XFCE more, but
I still have i3wm available to me when I feel it is especially suitable.
I like trying out different window managers. Next I will give ratpoison a
shot. IMHO the utility of window managers vary by work flow. How you do your
computing will tell you which window manager is optimal for you at that point
in time. Still, a person usually spends most of their time in one window
manager. Lately, for me that has been XFCE on my desktop computer and
Trisquel on my laptop.
If I recall, one thing I disliked about i3wm is I couldn't get my desktop
keyboard's media buttons to work (like volume control, for example) My laptop
media buttons worked fine. This could probably be fixed with a custom
keybinding (to keys other than the multi-media keys)