I like this, opposed to other solutions to HTML's verbosity, in that this is like a Vim macro language. Quick to type, then expanded to full formed HTML. No need for any other compilation or intermediate processing to HTML.
The drawback, though, is that you can only use this to generate HTML quickly the first time you write it. Changing the code once it's generated is just as painful as it was when you were working with just HTML. This kind of write-only coding is like throwing away your source after every build.
While this is very cool for producing HTML, I still like HAML and StaticMatic better because it's reproducible. The Zen Coding plugin and this both look like they are just shortcuts, whereas HAML sticks around and gets expanded when I compile.
And I don't lose that. I have no problem writing HTML with the shortcuts I already have - it's maintaining what's there that's the real pain, at least for me.