Great quality and design concept! But I have one criticism which prevents me from dling and using. And that is simply that the google button is too ambiguous. To my mind, and probably others as well, the question comes are you linking to Google+ with that button, or Google in general? If you were to make it a g+ instead of a g, it would be perfect.
(And I'm sorry, I know that every designer gets loads of criticism. I just hope mine was helpful )