I signed up for this the other day and so far really love it. Write a markdown/text file in Dropbox and within 30 seconds or so it's published as a nicely-rendered blog post. As someone who used Jekyll for years and got tired of running hosting and doing rsyncs etc, this is really nice for personal blogging.

The usability of the blot.im site itself is a bit lacking. You get a totally different UI when you're logged in, and the links to documentation on how to format your posts and what the different dropbox folders mean are gone. I had to open an Incognito window to find the documentation (spoiler: https://blot.im/help). The service is dead-simple to use and supports a wide variety of posting styles and formats.