Can someone explain the advantages of using this over mori (which doesn't include cursors per se at the moment, but are easy to implement on top of mori data structures)?
Amongst other things, it's about 1/4 the size, and sticks to plain JS for those not familiar with ClojureScript.
Yah. I don't know ClojureScript but that doesn't stop me from using it. And David Nolen pretty convincingly addressed the size question in "Javascript Modularity Shaming"[1] - i.e.: use Google Closure Compiler.