What I really like in this library is it provides an automatic case class <> json binding (so it's convenient) but without using any Reflection: It uses the Scala Macros and is type-safe.
See also: <a href="http://mandubian.com/2012/11/11/JSON-inception/" rel="nofollow">http://mandubian.com/2012/11/11/JSON-inception/</a>