jameswyse, Montage was designed to help build native-class user experience by providing native-class APIs and designs while embracing web technology and using it for what it does best. Montage offers very similar features Angular does, but with different design decisions and offer more. Montage has a very clean Component structure that are offer complete encapsulation and uses pure HTML5 templates: real document and no string based templating language in markup , no new tags to remember either, but a real object serialization that maintain a clean separation. Montage offers 2 way data bindings with converters, property change observing, delayed drawing for maximum draw rate etc... Montage today is server agnostic unlike Derby or Meteor. Don't get me wrong, that approach is very exciting and I want to see Montage go there, but we're focusing on taking front-end HTMLr applications to the next level, working with whatever backend you may have or like.
By choice we're a modern framework that require ES5 and a modern browser, and we've focused a lot on mobile where such browsers dominate. Hope you explore it further!