I use Markdown a lot on my Rapidweaver sites, as most of them are information, rather than graphics, so Markdown is ideal.
The inconsistency of the way Markdown editors stick, or not, to the Markdown guidelines drives me up the wall. Particularly the two space at the end of a line for a line break rule. Some say they do, but don't and others make no mention of it, but do.
I like the look and feel of Typed/Focused, but have tended to use MultiMarkdown Composer. If Focused is going to be developed, then I would love to stick with it.