The Spindle Error Analyzer has been used and documented in articles in the trade magazines. Read the articles online:
A 2011 article about using the micro-machining version of SEA.
A 2007 article in American Machinist documenting the tendency to errantly assume that the fundamental problem in machine performance is the need for a spindle rebuild.
A 2004 article in American Machinist about the use of SEA with current ANSI and ISO standards for machine tool metrology.
A 2007 article in National Instruments newsletter about the data acquisition system used with SEA.