Never let it be said that I was afraid to try new things.
I like it. It picks up a lot of features that I wish were in screen — like the concept of panes, or being able to arrange a layout on startup. And switching between panes in tmux is far easier than screen’s tab cycles.
Some of it is still a little shaky though. And I really wish there was something equivalent to screen’s idle option, but I can’t find one.