I just installed this and what I found was that it works nicely but, at least on OSX, it renders correctly but doesn't copy # or ## elements during a copy / paste operation. It correctly saves them to do disc but doesn't put them in the paste buffer. Pity. Its a pretty app but if they got that wrong, I wonder what else is lurking.

I don't need another editor that writes files. I could, however, use something I can paste markdown into, fix a formatting issue, and move back to a text buffer in a browser / Github readme, etc.