"Sturmgeschütze - Armoured Assault Guns" by Bob Carruthers is a good overview to the various models of Sturmgeschützen (Stugs) produced by Germany before and during World War II. This short book provides an interesting potpourri of facts and information on Stugs, such as development information, specifications and differences between the various models, short bios on a few of the top Stug commanders, and so on. This is not an in-depth treatment with reams of hard data and cut away diagrams, it's more for the casual WW II buff or armor treadhead.
An interesting thing the author does is to reproduce various contemporary articles and assessments from both the Germans and the Allied side about the Stugs. It's interesting to see what they got right and what they got wrong (such as stating that the Stugs were open-topped, when in fact they were fully armored). One minor drawback of doing this, though, is that there were a lot of repetition between several of the assessments, and they sometimes interrupted the flow of the book.
There are a good number of photographs included, too, but on some of them it was hard to see very much detail (on my kindle). The author also includes information on how many of each sub-model was produced and how many were given to other Axis allies.
Overall, this is an excellent value for the price. As noted above, this is not an exhaustive study on the Sturmgeschützen, but it's a good introduction and overview of some of the most common, yet least studied armored vehicles of World War II. Four stars.