Is Google's Polymer a fully functioning Frontend Framework to Subsitute OR Complement other Frontend Frameworks?

Question

The question is in regard to AngularJS, BackboneJS, EmberJS and the other frameworks.

I have to translate a project from php to javascript and I have to decide, if I

Answer 1

I put together some router demos. The "missing parts" really depend on what type of application you're building.

https://github.com/erikringsmuth/polymer-router-demos