It's like looking at Singapore Math through a funhouse - half cogent, scripted explanations that serve as an instructional guide to the way Singapore Math teaches the basic operations of addition, subtraction, multiplication, and division, and half "now have your students do the kind of ridiculous group work currently faddish in the US".
Not particularly useful to me; I'm a mathy person, and am marching my reasonably mathematically capable children through the Singapore Math textbooks to supplement (or replace) the bilge provided by the local public school district. However, I can see the book being helpful to elementary school math teachers stuck with a less capable curriculum (or no curriculum) who need a few pre-done lesson plans and some additional explanatory arrows in their quiver.