I have it. Some of it is a good read, but about half of it is just lists of units and personnel, which is of very limited interest to me. The first part of the book however is excellent, it has some first hand accounts of ground attack operations (which are very interesting) and lots of good info on the planes, their arms and equipment and how they operated. Lots of photos which I have not seen elsewhere as well. Some details of markings and a lot of colour profiles.
If you are really interested in German ground attack aircraft and operations, I would say it's worth it. If you have a passing interest, it's a lot of money....