Getting started with Ember is a lot harder than your comment admits. I tried Ember recently and there was still a lot of stuff that was broken including the data model. That would make building a non-trivial app hard.
@atomical, the link to trek's article above puts it more succintly:
Ember applications start out with a complexity rating of 4/10 but never get much higher than 6/10, regardless of how sophisticated your application becomes. Backbone starts out at 1/10 but complexity grows linearly. This is a natural side effect of the types of applications the two frameworks were specifically created for.
What I'm investigating Backbone/Ember/whatever for is a semi-embedded device that will ship with a web interface, so some semblance of stability is a major plus.
Web production != shipping on devices production. You can very easily ship updates to the former whereas the latter is tricky. It means we need to be careful with everything we choose.
