...it isn't perfect. Still, it's the best one if you're looking for a Black Sabbath overview, with it's great sound quality and two packed CD's (79+ minutes) you can't go wrong. This one tops the Rhino two disc set.As for this collection, my only complaint would be a little less material from the 1975-1978 Ozzy period and more from the Dio and Gillan albums. Born Again (with Ian Gillan) for example, is one of the most underrated Sabbath albums and the only song they used wasn't even one of the better ones. I think "Disturbing the Priest" would have been a better choice to close out this collection, not to mention "Trashed" or "Born Again" would have been good if they had given more time for the other singers. Anyway, most people aren't buying this for the Gillan or Dio selections but rather Ozzy, even if it isn't good Ozzy, because the media tells them Ozzy, Ozzy, Ozzy.Also not good, was the booklet's printing, which was rather small and hard to read. But maybe that was just my copy. If you are looking to have a good overview of Black Sabbath, save money and buy this collection over Rhino's two disc set. Oh, I'd love to see something like this for the classic Deep Purple lineup. After all, they are one of the big three: Purple/Zeppelin/Sabbath. Case closed!