I just finished my first two chairs based on plans from this book, and for the most part am pleased. I am somewhere between a novice and intermediate carpenter, and found the book reasonably easy to use. Two chairs took about 2 weeks to finish, with an hour or so spent most nights.
The good points:
There is a complete materials set.
The instructions are straight-forward and logical (except as noted below).
The end result is a fairly good looking chair.
The bad points:
The directions include an option for a slightly rounded chair, rather than just a flat back which I find uncomfortable. Instead of just making this a completely new set of directions, there was a whole set of modifications to the existing instructions. They were a little confusing, and required a lot of page flipping to integrate. How much more could it have cost to just add another page or two to the book?
Also, there were an option for a profiled seat, but no specifics. While it is true that this is somewhat of a personal preference item, the book only offered an instruction to figure out what was comfortable to you. There should have been a general suggestion as to a profile. If you want a rounded seat, you are on your own.
Summary: I found the shortcomings above to be problematic. I bought the book because I just wanted to cut and screw together wood without a whole lot of thinking. If I wanted to design a chair, I would have done that. I ended up doing a bit of work creating a seat profile.
Other than that, it was ok. It was better than some of the other books I have seen for clarity and description, and it was obvious that the author had actually built a chair from the plans.
I have seen plans that were more detailed and complete for the options listed above, but this is certainly a good jumping off point. And if you are comfortable in a flat-backed non-profiled seat chair, the instructions are perfect.