They are pretty interesting. I have ones for the B-25, B-36, and F-86. Lots of photos and drawings of different variants. A lot of reproductions of pages from engineering drawings or technical manuals. Not a lot of performance data, but plenty of information on every technical change between models and information about subsystems. For the B-25 they had some really cool info on all the different armament variations. Not a lot of color stuff though, so modelers might not be very excited.
