Honestly, even for someone that started his career making table HTML layouts with inline styling it's a major PITA to code up emails that look respectable on all clients. I can't wait to try this out.
They let you write HTML and CSS, test in the browser, and only at the last moment convert `p { text-color: #333 }` and `<p>..</p>` to `<p style="color: #333">`