I consider myself medium to advanced in identifying the mushrooms and I've been collecting them since year 2000. This book is impressive by the amount of species described, over 1000. It is a true encyclopedia and is rather big in size, yet it is cheap. These are the things I like about it.
What I don't like much is the poor quality of the photos. They appear quite blurry and have too much contrast to compensate the blur. Parts of the mushroom that in reality are grey look white on paper. Overall, I am disappointed in the quality of the photos.
Another thing I don't like much is that the similar species are missing from descriptions. One of the most important thing in collecting the mushrooms is to identify the right one among other species that could be very similar. The subtle differences between species is the key to a positive identification, but this book does not include any comparison. Also, the descriptions are not complete. They include all important details, but it would have been great to have even more details.
Don't get me wrong, it's a valuable book, but I've seen better in terms of descriptions and pictures.