It is a bit of a subjective compliment, but truly: Cameron has done an amazing job writing the best manual I have seen in a long long time. It is very complete and detailed. As you can already see here in the tome of contents (PDF).
Also a big thanks to the publisher Matrix Games for doing the staggering amount of excellent DTP work.
Now… detail is important, but at a 300+ page size it is maybe even more important that the manual is well written, witty at times and has 100s and 100s of screenshots. I can already disclose that is the case. More news to follow on the Barbarossa manual in the near future.