A very nice looking book, with very useful formats for making or modifying constructs in a 3.5/Pathfinder game. While many equilivant constructs can be found in Monster Manuals/Bestiaries for a cheaper gp cost, building a completely customized construct has a great appeal.

Since I'm playing as a wizard that wants to build a construct body for themselves, the special construct abilities actually give you a chance to do that.

Great book if your character wants constructs, or if you want to throw new construct builds at players who memorize monster stats.