I like that it allows me to make changes without needing access to my web server, as well as being able to use markdown (for writing blog posts). It's also easy for editing images if you don't have Photoshop or something similar installed locally. That said, there are better editors out there - such as CKEditor which has more features than MarkDown does, but less "clutter".
The fact that this tool doesn't require any code makes things easier in terms of learning how to edit content onceβ¦