I don't just love the GURPS system, but I do love their supplements. Like the rest, this one is suitable for any system, although it does reference specific GURPS books more often than earlier books in the line (GURPS Horror, GURPS Magic, et.al.). The system itself is easy enough to parse for old school gamers, so you aren't missing anything but if you have other versions of GURPS, like I do, it makes it even more difficult to find things.