The one criticism I've heard about the book from the professional mycologists is that Arora did not do microscopic analysis on his specimens so as to actually prove what species it is. If you approach the book from the standpoint of this being the best book on the art and science of mushroom identification based on macroscopically observable features, you will be fine. It is Arora's expertise in this aspect of mycology and the detailed and clear descriptions of the species for identification purposes that is exceptional about this guide.