Sheshunoff Internal Auditing Manual

Hello all -- I am a brand new credit union internal auditor in the process of building a formal IA function.  I noticed that Sheshunoff publishes an Internal Auditing Manual for Credit Unions.  Does anyone have experience with this publication?  If so, is it a worthwhile purchase, or does it mostly duplicate information available in the ACUARP audit guide?  I am hoping that some of the experienced internal auditors on this board can provide some feedback.           Scott Adams