I have not, and while it looks cool, it seems to be optimized for data transfer between applications, not a human readable config format.
Transit is more about data transfer, but EDN is mostly meant to be a better JSON (useful date types, doesn't care about commas, has comments, etc)
There is also a similar project - Hjson, a user interface for JSON- https://hjson.org/
1. Extensible, custom types
2. Streamy, efficient, compressed and fast, leverages platform's existing native/optimized JSON parsers
3. Wide platform reach
4. Made by Rich Hickey
http://blog.cognitect.com/blog/2014/7/22/transit