I found it relatively easy to use, but it was a pretty simple thing I was dealing with (one-page registration scheme). Having Coffeescript built in was quite nice, since I find it much easier to deal with.
I don't see it as being better than major CMS-style js libraries like Angular JS (which I started playing with recently), but it was pretty easier to learn for the toy application I was building. Being able to deploy to Heroku through the command line is neat, and the auto-reload on changing the HTML was pretty cool too.
(I'm not in any way affiliated to the person who wrote it, just someone who used it for a small project.)