Black Sabbath best-of discs continue to proliferate at alarming speed, and Castle's particular version is hopelessly outdated.
The track listing is decent enough, but falls well short of a full CD's running time (it was assembled in the vinyl era) and is transferred straight from the master tapes, without any attention to mastering them for CD-quality sound.
Hence, it's utterly avoidable.
If you really only need to glimpse Sabbath, We Sold Our Soul for Rock'n'Roll is still the place to go.