Wow, this is really nice, considering the fact that it's coming directly from Google. However, I really urge you to also try the Material Design theme from Sema

Wow, this is really nice, considering the fact that it's coming directly from Google. However, I really urge you to also try the Material Design theme from Semantic UI framework - I can tell you honestly that I haven't seen a framework as comprehensive and elegant as it. It's a pleasure to not having to write a custom class because what you want is already provided by the framework in some form or the other. Just my humble opinion.