i got the collectors edition just cuz its a hard cover,& it has a free map& tells you when the other bloody half is coming out (ya they split it in half again) its been pretty help, but extrodinarily unhelpful at the same time, the book for Ruby&Sapphire (that was the last time i had gotten the book) was infinitely more direct,& helpful telling you exactly where the items where,were,& how to get to them, the Black&White book just gives you a list, several pokeball symbols all over a WAY too tiny map& says go find it, it doesnt even tell you which item is which,so you tend to get a bunch of useless crap you gotta sell before you finally find the TM, or item you want.
But other than the tiny maps, the lack of helpfulness, & the slightly annoying bakc-tracking with the book (they put EVERYTHING you do threwout the game on the page which is why the maps are so small, you cant fit it on the damn page) the book is great, the unova pokedex at the back and helped me a ton :) and the book has its usefulness at times, like telling me i completely missed& overlooked HM Strength& gotta go back for it lol