From the reviews:

„No doubt, the work presented in this research monograph is a fundamental contribution to the compactification theory of moduli spaces in general, and of moduli spaces for abelian varieties in particular. … the present monograph is written in a very lucid, comprehensive, largely self-contained and enlightening style, including numerous additional remarks and hints.“ (Werner Kleinert, Zentralblatt MATH, Vol. 1165, 2009)