What I like most to read about is, pilots who flew unusual aircraft and are good enough at writing to let me experience it, in perfect safety. This book does that in spades.
Highlights are XF8U-3 Crusader III, YF-12 and XB-70, with lots of lesser stars in-between, there is also a good deal about space research.
I'd say you need to be aviation or possibly space enthusiast to enjoy this one, but if you are, wow!