Paul describes how he used a version of Stypi with a slight modification that colored all the text that ultimately got deleted in yellow to write a blog post:
"What struck me most is the way writing seems for me to be a stick-slip phenomenon. Initially I fumble about and keep rewriting the same sentence over and over. Then I get rolling and write a sentence or two that make it almost intact into the final version, and then I get stuck again. Watching these parts is like watching a mouse find its way through a maze."
The end result is a rare opportunity to experience someone else than you writing and editing a text. I find it very reassuring to see that it's not an easy process even to someone calling themselves an essayist. Go have a "read": Startups in 13 Sentences.