I have been fooling with it for a while, and yes, the rate of change is pretty painful. For example, there have been two significant changes to iterators recently: first the relatively minor change to (internal) iterator functions to return bool, allowing them to be nested, and then the complete revision to external iterators.

The libraries are also in a high state of flux, with stand-alone functions being replaced by trait methods and some functionality disappearing or being replaced.

http://maniagnosis.crsr.net/2013/07/letterpress-cheating-in-...