As a Scot, living in Scotland, this is the one guide book that I refer to again and again. When holidaying in Scotland, we plan whole days around this book. We'll plan a scenic route to see a waterfall or a good walk with the dog. We'll work out what eaterie we're going to have lunch in, and invariably, we'll be staying in a hotel, B&B or guest house recommended by this guide and have a pint in one of its suggested pubs.
The thing I like most about this guide is that it's not neccessarily "Scotland The Most Expensive". It has everything from "Best Fish and Chip Shops" through to top michelin starred restaurants. All this via "Best Waterfalls", "Best Woodland Walks", "Best Scenic Drives" etc. etc.
Once you get into the way this book works (persevere - you will get used to its indexing), it becomes indispensible.