After some complains about the FileOptimizer's interface, arguing, it is ugly and chumby, I have created an updated prototype with a ribbon.

To me is more attractive, and easy to use. In the other side, it eats some screen space, and may seem overloaded. Also, with a metro like style with black colors, it is not so appealing.

What do you think? Do you consider the ribbon pretier and more usable?

With ribbon:

Without ribbon: