I just returned from a trip to Kandy, in central Sri Lanka. This Lonely Planet, like others, packs a wonderful amount of info into a concise and pretty easy to navigate little pocket-book.
When I was in Mexico, previously, I'd come to expect LP to list nearly every restaurant, hotel, etc. in the area. In Colombo and Kandy, I found that while it had a good enough selection that one could go ones whole trip only on recommendations from the book, there were also a number of stores, restaurants, etc which were really worthy of note (imho) that were not included.
In short, a great book, a worthy travel companion, and a wonderful fallback, but not the all encompassing guide to everything that I sometimes expect from LP.