Oz and Lenswerks,
Just about two weeks ago I bought the other two volumes in that series by the same author: Waffen-SS Divisions and Panzergrenadier Divisions. I am very impressed by these books because they bring a lot of disparate info together into one little book, making them a nice quick reference guide. I really enjoy flipping through the pages looking at all the various colour illustrations of the multitude of vehicles used in the German army, associated with some of the divisions that used them. No other book I've seen offers that. Most importantly, they're available for a bargain price at my local Chapters bookstore.
Now all that said, if you look up the Amazon reviews of these two books, you will see they contain several inaccuracies, like most books do. One of the more problematic aspects is that some of the tank illustrations are used multiple times in the incorrect place (e.g. showing a panther that clearly has Grossdeutschland markings under a Waffen-SS division). So I would be a little bit careful of using that colour illustration of the Panzer I in that book as an authoritative source on its camo. A book dedicated to the Panzer I would be a better bet. However, it could be that the volume you have on Wehrmacht Panzer Divisions, being the first volume in the series, does not suffer from the inappropriate recycling of illustrations that my books do. Unlike them, the Wehrmacht Panzer one was co-authored and done a number of years earlier. So it is hard to say. I know all this because I've been trying to track down a copy for a good price to complete my set.