I read "AWP" a few years ago, and I enjoyed the book, I was shocked at the reaction to Kancho's death! Also, I found some of the reactions to training, er, disapointing. I gave my copy to my (sadly also Late) teacher, who was once a student of Kancho.
Now, having spoken with a fellow Aikidoka recently who is in the book, I have a better perspective.
It is a good book, but I think it should be remembered the approach that Robert Twigger is taking in his authorship, and the conditions they endured. I would say it is definitely worth reading, particularly by those practicing in unchallenging and comfortable ways.
My teacher disliked some of the commentry, but recognised the conditions, although with a somewhat differing view. I must say that his time in Japan was quite a long time previous to Mr Twigger's time there.