Nothing too special other than it collects together some very good sources of individual songs. I bought a copy in the late 1990s and ended up getting rid of it simply because the accompanying booklet was so poor. Also, there was too much of a relaince on Tokyo 1985 (the worst sound Queen ever produced live) for my liking.
You're better off getting a track list, downloading the material from elsewhere and making your own box set. There is better source material available now as well.