I must say I respectfully disagree with the previous reviewer's comment that the information here is all available on the Internet and isn't specific enough to be really helpful. If you actually read the couple of pages devoted to each campground, you'll find details that definitely are NOT covered on the DNR Website or in any other readily available source.
On every camping trip, I take notes and annotate my map in preparation for our next trip. But each trip, I like to try a new place, so my notes don't always help! The info in this book is exactly the kind of information I would like to have before I go: what amenities are there, best loops, advantages and disadvantages of each area, and--most useful--the exact site numbers of sites that are especially good or especially avoidable (and why). I've found a number of very precise tidbits that have, IMO, been worth the purchase price.