I'd be really interested in knowing how it compares against lazy.js: http://danieltao.com/lazy.js/
edit: added lazy.js to the benchmark and transducers.js wins hands down. Lazy also starts way behind _/lodash and only catches up after >50k elements.
https://github.com/swannodette/mori
I would be interested to know how its transducer support and performance compares to transducers.js.