Pros: Because Polyfill is who web should be built. It's the best way to develop a web applications. It's future friendly. It's better to have one file for a co

Pros: Because Polyfill is who web should be built. It's the best way to develop a web applications. It's future friendly. It's better to have one file for a component. Example: https://github.com/PolymerLabs/google-map https://github.com/PolymerLabs/google-map Where they have everything. CSS, JS and Template in one page. Cons: You shouldn't be using it for everything and of course not for the next project. Google doesn't use it for production. It makes tons of requests. Comments: Try to use it for few demo projects test the performance and take a decision. If you want to use it. It works best with require.js and you can't just dive into it Polymer(Deep Sea) without having experience(Wearing a oxygen cylinder). https://gist.github.com/tantaman/7222599 https://gist.github.com/tantaman/7222599