The Lonely Planet series has been excellent for other holidays I have made (such as Finland, Austria, Venice) so I took time to read the current (3rd) edition months in advance of a short holiday in Sweden, and studied some parts very closely.
The early chapters are very upbeat - the authors are clearly thrilled by Sweden and are keen to share their enthusiasm. The history pages were well balanced and gave sufficient background to enable understanding of Sweden's present.
I have qualms with the up-to-datedness of some details which I relied on (having found out the hard way with disappointed children in tow): the examples I am thinking of is the non-existent Ice Gallery at Osterlanggatan 41 (page 74) (it has been a clothes shop for the last three years) and the non-existent Svea Viking (page 85) (great old wooden ship done up to resemble a Viking longboat, moored outside the Royal Palace).
The other difficulty was that the maps (pages 68-69, page 80 & page 84) are nowhere nearly detailed enough to allow progressing on foot (a separate, indexed, map akin to an A-Z is needed).
All-in-all, the book remains useful but is not reliable so, unlike others in the series, it needs checking before committing yourself to a destination.