What I really like is that hr.js isn't built on Backbone, it rather is highly-inspired by it. That's a BIG advantage over things like Marionette/Chaplin/etc, because Backbone has certain holes/assumptions (see my comment elsewhere) which cannot be completely negated in an elegant/simple way, or even at all. Overriding the heck out of everything, or adding a gazillion new classes/sub-classes, or tossing the original component is not simple and elegant when done on a grand scale, imho.

This is to say that hr.js seems to be offering more out-of-the-box solutions and flexibility than Marionette/Chaplin/etc, while being a lot cleaner and more straightforward as well. Good on you hr.js :)