To all those looking for the definitive Halo Reach companion, this book is it! It has 448 pages of pure Halo Reach love thrown into it. The book covers everything from the campaign, multiplayer, custom maps, Firefight, Forge, Covenant bestiary, Covenant and UNSC weapon and vehicle descriptions/backgrounds, and some background of each of the characters in Noble Team. It's chock full of information for multiplayer/campaign/Firefight tactics, weapon load out suggestions, Legendary tips, story and enemy blurbs, gaining achievements, and over 90 pages of gorgeous artwork straight from Bungie. Some things are slightly off, such as the amount of credits earned for killing enemies, and the order of ranking unlocks, but overall, the rest is pretty accurate. I agree with the previous reviewer that they could have done a lot more to show how to discover all the data pads besides giving vague hints as to their locations (a walkthrough with pictures would have been nice!) but since finding all the data pads doesn't net you an achievement(s) in the game, I can forgive the guide for that oversight. I would have rated the guide as a perfect 5 out of 5, but am giving it a 4 out of 5 for the reasons of the inaccuracies in some rank unlocks and a few credit amounts for killing enemies and achieving certain in-game goals in multiplayer/firefight.
Overall, the guide is definitely worth the $18-$20 it's going for right now at Amazon (as opposed to going to a physical retail store where you might have to pay $34.99 plus tax - Ouch!). It's printed on high quality glossy paper, comes with a dust jacket, and has one of 6 characters on the hard bound cover (I received the one with Emile on it - the visor has the skull portion of his helmet in embossed gold foil! Lovely!). Some might say guides are bathroom reading material, but this one belongs on your coffee table along with the equally resourceful and informative Halo Encyclopedia. If you love Halo, you need to buy this guide.
A beautiful book overall and highly recommended! Buy it now!
Update 1 (Sep 24, 2010): As far as my comments about the datapads, I would also like to mention that Bungie does have a history of leaving the most mysterious of secrets out of their guides. In the guides for Halo 2, Halo 3, and ODST, there were only very slight hints as to the locations or presence of those skulls and terminals in the (respective) guides. Bungie leaves it up to the Halo community to find these secrets. I guess it makes the hunt for them all the more satisfying! Thanks to D. Walsh for jogging my memory!
Update 2 (Oct 15, 2010): I have noticed that ranks above Lt. Colonel Grade 3 are not listed in the guide. Also, the guide does not show ALL the Armor unlocks in there (many armor types are shown after you reach a certain rank in Halo Reach). This won't affect my overall score, since the guide is so informative, but I will admonish Bungie and Brady guides for this. A little more time should have been taken to iron out the inconsistencies in the guide and the complete ranks and unlocks should have been included.