If you didn't know that an 8x56 scope provides a larger magnification and brighter image than a 6x26, this book is for you.
However, if you expected comprehensive product reviews or comparisons, fugedaboudit. Want to know whether a scope has 1/8MOA clickstops or 1/4MOA clickstops? Fugedaboudit. You will get tube diameter, magnification, ojective lens diameter, parralax adjustment, exit pupil diameter, eye relief, field of view @ 100 yd, length, weight, and MSRP. Who needs more information to decide whether the $2000 scope is really better than the $250, or more importantly, how the various scopes in the $250-600 range compare.