The thing about Dr. Gregory's book is that it is the most intuitive, right to the point, easy to read/understand, and concise book on Counterparty risk management out there. The current European banking crisis and the crisis of 2008 has put a new emphasis on credit risk management. If you are the business of managing risk, this is one of the books you need. It does not dive very deep into derivation of formulas but focuses more on what the maths means and how to use it in proper way.
If you are interested in knowing in-depth topics like EPE, PD, PFE, CVA/DVA, Bilateral CVA, impact of netting and collateral on credit risk metrics, Basel II 1/2 and III, impact of clearing houses on OTC derivatives market etc, you need to refer to this book. I highly recommend this book to the future risk managers as well because they need to know the current and the future of credit risk management in banking space. This is my first review on Amazon (and probably my last) and i wouldn't have spent time on it unless i thought this is the book that market practitioners have been missing in counterparty risk management space. It is good stuff.