This could be very useful to the person who's looking to buy just one book, though it seems like a lot of material to cover in less than 80 pages. But so many books out are either too superficial or too in-depth. This might be a good compromise.

Completely agree. You'd be (very) hard pushed to give decent coverage to the 251 in one book - yet it was 'included' in the previous volume... Unfortunately, and this is NO reflection on the authors of these books, Concord needs to decide where their core market IS - 'cos it sure ain't the 'hardcore' of modelers..