It's easily the most advanced of the tiling wm crop, and by a long shot. Just some bullets:
- Floating/tiled can co-exist on same workspace (just attach/detach as needed), can also trivially set filters to have e.g. all dialogs and "all gimp-windows" float automatically.
- The tabbed frames metaphor is infinitely superior to the "one window per frame" metaphor that everyone else is stuck with.
- All configuration and extension is lua. It's an absolute joy to work with.
- Mouse works as expected. Just drag frames to resize the grid, drag titlebars to move windows into other frames, etc.
Up to this day I don't understand how people put up with the obscure limitations of the other tiling wm's (foremost: the one window per frame constraint, forced set of layouts that never work quite right, etc. etc.)...