When you say very technical, do you think an undergraduate physics student who has completed both halves of undergraduate QM and E&M courses as well as an undergraduate GR course could meander his way through this book?
Since I'm posting this I will leave a suggestion even though I mostly read fiction.
For those wanting a lighter introduction to Nietzsche then Zarathustra I enjoyed On the Genealogy of Morality. For some truly bizarre (in my opinion of course) philosophy that I nonetheless found thought provoking look no further than Kierkegaard's Fear and Trembling.
I also echo many of the above of course.