strange jazz boxed sets found on amazon

i saw boxed sets on amazon featuring some of the greatest jazz artists of all time-cannonball, brubeck, smith, rollins, peterson etc.. putting together multiple albums on multiple discs instead of one album per disc. anybody have any input on these. i would probably be interested in red garland and oscar peterson although i am troubled that most of the peterson selections are from his songbook series which i must admit i do not know much about but you do not here about his songbooks like you here about ella's.