This is really the best guidebook to the Caribbean by far - and here is why:
1) It covers The Bahamas. Technically not part of the Caribbean, culturally very much so. They are omitted in the Fodor's, Frommer's and Footprint publications. So if you want coverage of the full potential vacation region, you have to buy the Bahamas guidebooks they offer - and pay twice as much. And if you are buying the Caribbean in one package and not books on Jamaica, Puerto Rico etc all individually, you want it less detailed but all in one. The LP book has the same amount of details on the true Caribbean Islands as the competition (or more) but packs in the Bahamas too! Only Rough Guide covers The Bahamas, but the latest edition is waaaay out of date - 2008.
2) It covers Haiti and Cuba. Haiti though not a touristy place is safe for tourists (despite what some media say) and is one of the best countries for culture and history enthusiasts in the region. Cuba is also an interesting place despite being controversial. Fodor's and Frommer's omit both countries. Footprint (latest 2007!) and Rough Guide (latest 2008) both cover these places, but are very out of date now.
3) Caters to all. Frommer's and Fodor's generally only have info on top and middle end hotels. They also omit some very off the beaten track places even in countries covered. LP manages to squeeze in backpacker hostels and off the beaten track gems and somehow still has a fantastic selection of the more top end places.
4) Fodor's and Frommer's are published annually, so they may be good when the LP is out of date (like last year), but now as a new LP guide came out, it is your best bet for 2012 and 2013 at least.
Note to LP users - sadly the book is changing into a bit of a mainstream guide. Off the beaten track places are covered a little less then in the earlier editions. For instance it is the only full Caribbean guide to omit Haiti's famous Tortuga (Ile de la Tortue) - covered in earlier editions, as well as the other books that have Haiti. If it wasn't for the very bad competition (especially in the Bahamas part - making you pay twice as much - that's mean!) I would give one star less for those changes, however in comparison, this is still a five star book.