I have an original (softback) copy that I found in a charity shop many years ago and its fantastic history piece if you like the background of 40K and how its evolved to where it is. Plus its got lots of cool artwork, in which a lot of ideas originate that become bigger themes in the 4Ok universe. Yet you can see how its sort of Lord of the Rings but in now its in outer space.
I never actually attempted to play the game. But its fun to flick though the pure imagination and wackyness of the options they put into it.
Is it worth buying a new print? Mine gives me great joy to own and cherish, if buying new was the only option I probably would.