I really love the hero unit. It's a great example of an animation that tells a short story, and gives you a feel for the app.

First you see a flat rectangle with drag handles, which sets your expectation, 2D WYSIWYG editor.

The rectangle animates into a 4 sided cube, 2D becomes 3D, it's a 3D tool.

Then the cube breaks into 2 angle brackets, the output is just HTML and CSS.

I'm left with a nice little feeling :) Awesome work