Cooper's book is quite good, and gives a very rare look at the "tail" operations, maint. and supply end. However, there are very many mistakes in the book about the German tanks he saw. Still, it is a very interesting read, and gives a good look at the logistics end of the war, a very rare view of a very rare subject.

I would recommend finding books by the veterans themselves, and preferably written some years after the war. Even then, take some info with a grain of salt. Official histories tend to be rather slanted, no matter which side they are from. For day to day ops etc of Tigers, get Tigers in Combat 1 & 2. Quite the good read.