I don't understand it. So you'll still have to use Photoshop. And you still have to redo the html from scratch. In what step in the web development process do you need pixel-perfect html that's not a Photoshop file and that's not a final html design? I just can't imagine any place I've ever worked using this for actual work, I just don't see a need for pixel-perfect yet not designed throw-away html mockups.

I might just be being dense today too.

I'm really trying to understand it, but I just don't.

Now, if it was a tool that helped me create html+css that I could actually use in production, and that would help me quickly create a visual design that looks decent, that would be useful for me.