MacStories has the detailed review of Drafts 4. Personally I have been using the app now for a week plus and it’s quite the app. It does a hell of a lot of stuff, and it actually quite complex. For me the best part of Drafts 4 is that I don’t have to figure out how to do too many things as the workflow exchange helps quite a bit.
While I like Drafts 4, these types of apps have really fallen by the wayside for me of late. The best use I have for it as of right now: a Birdhouse replacement.
Powerful app, and there is no doubt in my mind that some pretty cool stuff will come of people using it.