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've used it as both, as an enhancement to an app written in another framework, and as the full framework itself, where it was responsible for every element on the page.

I really like just about everything about Polymer, so I've been very happy using it for the whole app, even built my own router. If you've got an existing app I'd recommend dipping your toe in the water, as Polymer works great composed into other apps to see if it's to your liking.