I have. It's good but not great. I think it goes up to the 90's. You could call it a primer as he gives a solid overview of the division. His heavyweight book is better as he goes champion by champion.
Rather poorly researched. You can find pretty much everything that is in the book by doing a quick search in google on each lightweight champion.
That's true but back in the day google want a thing. If you haven't bought it don't buy it. It you have it's not a complete waste of money.