This is a good example of why some apps won't get my further interest: the GUI looks nice but it is not clear what features are included. Does it support scripting? Is there a preview pane? What about custom fields?
At the moment I am using MarsEdit, which is the best tool I found so far to edit WP posts on the mac. As there is no demo version available and the site only speaks about formatting and retina graphics, I have to assume there is not much more included.
Tell me, there is more and let me try it out first and I will consider looking closer at this app.
side note: this has nothing to do with all those "app store bashing" comments. The problem is not the app store, the developers just don't get it right (provide enough information, demo version, ...).