Ed Bauman is a fixture on the Reason Forums. He is one of the most knowledgable and certainly most helpful guys out there. Many times, I have seen a post start or end with 'Maybe Ed has some ideas on this...' hoping to get a response from the master!
This ReFill is rather eclectic but jam packed with a lot of great stuff. It is a compilation of seriously advanced Reason techniques, packaged up with some great documentation. In fact Ed himself describes his ReFill as "A helpful collection of creative combinators for Reason and Record." It's also important to note that the ReFill is not presented as a collection of patches, but as a collection of Reason song files. This lets the author present little song examples to demonstrate the functionality of each one.