I love this book. I used it extensively when I was working on my RPG Supplement for Aliens vs Predator, and it came in handy so much. Still read it now, apply what I can to various different fictions & stories.
I paid a sweet £8.00 for it off my friend. If he knew what second hand copies go for now, he'd be really pissed off. His loss, my gain.
Some of the tech is dated by today's standards, the tanks just look outright like any tanks you may find in service today, but the stuff from the films themselves is just fine.