I am usually disappointed with Greatest Hits collections, but in the case of this collection, I'll make an exception.
This is probably the best Greatest Hits album I have ever heard. It has great tracks from every major phase of Cash's career; from Sun Records to American Recordings.
I grew up listening to these songs, and to have them all on one disk is great. Of course it is lacking, as any greatest hits collection will be, but Volume 2 sums it up fairly well.