I have the first book, and I have to admit that I am not impressed. I really tried to like this book and do try to work through it. The problem is that some of the examples are terrible and seem to have little to do with the topic or help with the 'exam' questions. This seems to be another case where a very high rated player is writing for an audience (below 1500) that is so far away from his experience that he has forgotten what these players need at this level.
I know I can't recommend his first book to anyone below 1500. Don't waste your money until you are much higher rated.
I guess so, but for all of the books it is still a lot, particularly if I end up not using them. btw how does the series compare with Pachmans books and the ICS course? I have Pachmans books and think the material is great but I have found that, particularly in the first book, the material is quite basic (which has caused me to skip some topics), but I am enjoying the second and third books.
If you're talking about Pachman's strategy books, they are quite different, as Yusupov deals with all aspects of the game, and also offers exercises (what you need to improve). I don't know about ICS.