I'm not talking about sound quality, but about comprehensiveness. For instance, some of the sets have a paltry amount of songs (32, IIRC, on Dusty Springfield's) while others (Connie Francis) are quite packed-50 songs on hers. Some thoughts: Engelbert Humperdinck's and Tom Jones's sets are quite packed, but I believe Jones's set only goes until 1975 and misses Say You'll Stay Until Tomorrow. The Carpenters' set is very interesting, a mix of hits and rarities. The Motown Classic Years (now two volumes, the first a repackaging of a previous set), is pretty good. However, the Temptations and Marvin Gaye sets (both repackages of previous, more expensive comps) missed a lot of important tracks. On the other hand, the right choices were made for the Buddy Holly and Chuck Berry repackages. The Aerosmith was a repackage of a previous Geffen collection. If not for Sony's own two-disc collection, Universal could have, through the Hip-O imprint, have licensed Columbia tracks. The Connie Francis mentioned above seems very complete. I'm surprised that the 2-CD Who: Ultimate Collection, hasn't been repackaged as a Gold set. If it ever is, the remastering better be improved. The original is awful. BTW, the Three Dog Night Celebrate set would be pretty cool as a less expensive Gold set.