I have a similar opinion to C3PX, I guess. I've not bought a game guide since... Geez, probably Legend of Zelda: Majora's Mask, back in 2000*. They're just too expensive when the internet is there for free. I understand if you're trying to find everything in a big complex RPG it's nice to have the book there so you don't have to run back and forth to the computer, but otherwise, it's not worth the money.

*Well, I also have the Starcraft guides, but those came with the BattleChest--both games and both guides for ten bucks.