Ember is really nice in theory but the API is quite confusing and it’s hard to know if you are following a good standard way of doing things when you write your code.
When you start looking around for help on how to use ember most of the example is built with ruby on rails in mind. Of course it’s possible to build ember applications for other platforms as well but very annoying to sort out all the rails talk.
The biggest problem with Ember is the breaking changes for now, this framework simply isn’t ready for production purpose yet. This post is just a bit of ranting on my part and nothing really constructive or gathered so please ignore everything you have read so far.
After posting this i was given a really good article on ember http://trek.github.com/