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.
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.