'This is the most important -- and thoroughly enjoyable -- soul reissue in years. ' Allmusic.com
That's probably all that needs to be said. These are just some of the best releases of all time, I paid a tenner for each which at the time I felt was a bit of a bargain as they usually sell for £13 quid. HMV are going a bit nuts selling these for £4.99, each one is a double cd release with details of the tracks including personnel, recording dates and a few sentences about the background to the songs/artists.
Couple this with a student discount and its an even better deal. If you want to delve a bit further than the well known hits check these out.