When I first received this book I wasn't sure about it, as the detail on each location was pretty limited I wasn't sure that there was enough to be useful, but having used it to follow three of the routes in practice, I'm a convert
The book sets out 24 drives through the best of Germany with notes on the route to follow, and the places along the way worth visiting with a brief description of each. The briefness of the description had worried me, but in practice it's enough to give you a flavour of the place so you can decide if it's worth a look, and then you can pick up the detail at the various attractions once you get there. This also avoids having to carry a brick of a book everywhere you go.
The book also gives suggestions of places to eat and stay - those that we tried were spot on. The routes themselves do a fine job of taking you on attractive tours, and skipping to the best sights.
Now a word about time - the book gives time suggestions that would allow you to do each route in great detail. For myself, there's a limit to how many museums & churches I want to inch through in a day. So routes that the book suggested would take 4 days, we did in one. Still, keep an eye out for the suggested additional excursions, as there is many a vineyard worth an extra daytrip.
A very worthwhile addition to the book would be a couple of pages on each of the hub cities. Unless you have access to a handy teleporter, you're likely to fly into Germany, so some info on Berlin, Frankfurt and Munich wouldn't have hurt (there's a great impressionist collection in Munich if you're into that kind of thing).
Still, I wanted to see something of Germany (and I give the local people top marks for friendliness & hospitality), and a copy of Back Roads Germany made the trip.