Having been to many countries and used many lonely planet guides. It is fair to say that this is not one of the better editions.
The Good:
*The additional sections are fairly interesting and there are great pictures to keep you occupied for a while.
* Maps and transport links are a lot better than similar travel guides, although they do suffer from inevitable timetebles changes etc.
* Covereage is relatively good for places off the beaten track
The Bad: The main problem with carrying around an LP, is that virtually every other backpacker in Thailand will have one too ( and theres a lot of them.) This means that any hotel with a recommendation can be expected to fill up quickly, to the detriment of other hotels that may be a lot nicer, but are not in the book. Also, once hotels have a mention in LP, standards often deteriorate as they know they are guaranteed custom. This is especially true of very toursity places such as the beaches and Bangkok.
Theres a lot of suspicion regarding how LP chooses its hotels, often they are fine, but often I was wondering why on earth anyone would stay in such a hell-hole. LP has a tendency to be way too optimistic about everything. Also, having seen some old editions, its clear that they have been recycling the same old blurb for almost a decade.
Essentially, this LP has some decent points, but restaurant and hotel listings, take with a pinch of salt.