What's the benefit of running vim-slime as opposed to just an arc repl from the command line? I've been doing that w/ the same vim/tmux setup you mentioned. I enjoy it.
Edit: I see that you can execute code from the vim window. That is a nice feature. Anything else significant?
No, that's pretty much it. I sometimes find it useful, but yes, mostly I forget it exists. Occasionally it'll bother me when I hit ctrl-c for unrelated reasons :)