I picked this up on a whim in San Antonio before hopping a bus south of the border. I am on a two month meander through Mexico and points south, and taking this along was a last minute impulse. I'm a pretty seasoned traveler, and have been all over the world these last two decades, and rarely bring a guide. Chalk it up to snobbishness and a misplaced adolescent purism: I would avoid the Baedaker bearing masses and forge my own quixotic way.. An approach that I have enjoyed, and never regretted.
So getting the guide was a change in policy. I thought I'd see how useful it was. And it's been great. I've depended upon it for cheap but clean hotels, cheap but tasty food, and information on buses. In all three categories it's shone. Not a single poor recommendation. I haven't spent more than 30$ a night on a hotel, and am usually spending less than $20, and in every case I've had a clean room with hot water (you may have to wait a minute or two for it to arrive, but it always does) and decent WIFI. I'm currently in the Centro Historico of Mexico City, and am paying 16$ for a groovy little room. It's the first time I don't have my own shower, but I'm not complaining. I'm not here for luxury. Simple and inexpensive is what I need, and that's what this guide has helped me find, without stress.
The bus system here is mildly complicated. Mexico has an excellent system, one that shames and makes Greyhound look like the low rent mess that it is. There is a range in quality and prices - three to six bucks in a ticket price can often make a significant difference in the amenities of the bus. This guide doesn't go into all the complexities (as to the differences between the different companies, say) but gives good information on the locations of terminals, the basic range in ticket prices, approximate travel times, and approximate numbers of buses on a given route each day. This is all very helpful, and though approximate, it has still been for the most part correct.
As someone else has said, it is a big book. I've brought some multi-colored paper clamps that I use to clamp shut the sections I am not currently using. I also use paper clips, sticky notes and book marks; as well as a highlighter, to organize and mark pertinent sections. This makes it much easier to use. I have two well marked maps of the country that I usually keep in the book as well. As I go along, I may begin to tear it up a bit, and throw out parts that I will not need again.. I ought probably get rid of the Sonora and Baja and rest of Northern Mexico sections now, since I will not be needing them.. The clamps and handful of strong rubber bands that I also have along will help keep the remaining sections in proper order.
In any case, kudos to Lonley Planet for a fine and useful guide. I give it my strong recommendation. Buen Viaje, Everyone.