Halakhic Man by R' J.B. Soloveitchik
I think his last paragraph summarizes his book very well.
Number one the vocabulary used in the book is above my pay grade. Didn't like it at all. But that was the translators work not his. Also my newest pet peeve, don't translate pesukim, transliterate them. It's so much harder to figure out which posuk it is when it's in English.
The same goes for constantly bringing down other philosophical works. I'm assuming that was one of his goals when writing the book. To show that you can be educated and be frum. (I honestly don't understand the appeal to this whole philosophy thing. I find it to be a whole bunch of fluff with no substance. Maybe that's my shallow understanding.)
Number two you can see clearly throughout the book how he and the Lubavitch Rebbe spoke. Very into bringing God into this world as opposed to bringing man to God's world, tzimtzum...
(It's even in the picture above)
Overall I don't think I learned much from it. It's just observations and comparisons of philosophies in fancy English with some hashkafa thrown in.