I was lucky enough to use the Divshot beta several months ago during a hackathon, and my team's process was indeed to copy the generated HTML into Rails ERB files at the end of initial design. But what was really powerful was the ability to WYSIWYG our way through discussions about what our product would do, and then just publish easily consumed code when we were ready to hack. Our alternative would have been an analogous process in Photoshop (slower and doesn't produce the base code) or to iterate the HTML during the discussion (much slower and requires the designer/developer to switch mental contexts quickly). It worked very well for our purposes and I see it being invaluable during client discussions.