I owned this compilation on vinyl - it quickly got worn out, containing as it did a dozen stone classic Soul cuts. The tracks on the original have been supplemented by more of the same on the CD reissue, and so now you'll get a full hour or more of 60's Soul.
All the original tracks came from the Atlantic catalogue, which before mid '68 included the licensing deal for the output of Stax. The ending of that deal, and the discovery that Atlantic had the rights to all the Stax output, effectively allowed this album to be released.
As to the music, unless you have no interest in Soul (in which case why are you reading this), you will have heard a lot of these tracks. No matter, when gathered together like this, the sheer quality of the output of Memphis/Muscle Shoals is staggering.
The classics by the likes of Aretha, Pickett and Redding made the original release well worth having. Now check out "Memphis Soul Stew" by the sadly neglected King Curtis, and the Mad Lads "Get Out of My Life", tracks which add to the appeal of the reissue.
Should you buy this? Well, yes, you should, unless your collection has all these already. As Bobby Byrd said "You know you got Soul, if you didn't you wouldn't be in here"