I like the features such as the partials and the no-nonsense HTML editing, but what kills it for me is the dual pane setup. I see this in many programs like markdown editors, and I cannot imagine a worse use for all that screen real estate. The reason for this, besides the raw redundancy, is that it kills the focus on writing, and forces me to look at how pretty everything I just hammered out on my keyboard looks. It causes me to second guess everything as I'm writing, and slows me down considerably. I would consider nixing the pane, replacing it with a preview button, and using the space to add either new controls, a media browser, or possibly even nothing for a more zen-like experience.