I have the book on my shelf and I regularly peek into it. Although for me it is more a reference. For example it perfectly answers why we have 8-way set associative cache and not more - the book gives a, well, quantitative answer.
More examples: how DRAM works, basics of NVIDIA Fermi architecture (or: SIMD vs GPU).
Although the book is rather dense and I would not recommend reading it back-to-back.
I loved that book!
I also got inspired by it recently and have written about the topic, not of the book directly, but of the generral ideas that inspired me in it .