Are they any good or in depth? For a beginner? I seen that they make one for the D5000 and was thinking about picking one up along with another photography learning book BUT if they arent very much better than the owners manual they come with than Ill spend my 20 bucks elsewhere. Thanks for any feedback as its much appreciated! Also if that series of books arent that great is there another you recommend for learning a specific camera or at least A DSLR?