This member of the renowned Lonely Planet series was an essential tool in helping me plan and conduct a family holiday tour around the highlands. All the information I wanted was supplied, including phone numbers of key helpers (such as lone operators - real heroes of rural Scotland - to complete otherwise isolating gaps in transport).
Scotland is a gloriously living place, so changes occur which would account for occasionally being out of date, as complained of by other contributors. From my summer's experience, each element appeared current and reliable.