If you are looking for an in-depth volume on tank recognition, or simply a book with lots of information, visual material, etc. on tanks this volume is likely to disappoint. On the other hand, if this is to be the first volume to sate someone's interest in the subject, it may well do (not for the committed enthusiast, though).
What you get is a selection of some widely used tanks from 1916 till the modern day, with usually two colour drawings, some basic (but not consistent for all) information in terms of dimensions, armament, speed, range and powertrain (some have added info on armour, main gun elevation and depression angles), and a quick description of the design phase. Generally some of the larger users are also mentioned but the list is neither up to date, nor comprehensive.
Information useful for spotting or recognising them (i.e. significant or differentiating features) is completely absent, even though it is promised in the introduction. Absent are also all tanks from France, Italy, Sweden and other countries, all of which played a role in tank evolution historically, as well as tank based support vehicles, such as self propelled artillery, self propelled AA guns, tank destroyers, etc.
As said in the beginning it is a cheap and easy entry but if you get beyond that stage, the book is more likely to disappoint than satisfy.