It is a modern spiritual classic, and it lives up to it, and then some. If anyone can really genuinely convey, through scattered and translated dialogues, the meaning of enlightenment, Sri Nisargadatta Maharaj's "I Am That" would be it.
I can see it taking some time to work through the book, reflect on it, and relate it to other beliefs and concepts going on in the mind. Such questions are often brought up in the book, and Maharaj answers them again and again without deflections or distortions from the only source available, which he sometimes refers to simply being Beyond. This of course can only happen if the questioners can also look beyond the limitations of the mind and really be with his responses.
Yes, I have also seen other comments on the book from talking to others who have either read it or just looked briefly into it that diverge well from your questions, and they have left me baffled. In both cases, there was considerable resistance in my attempts to discuss it more, so I let it be in peace. Learning opportunities are really everywhere.