All I can say to help you out is that I have heard the RCA box, bought it for my parents for Christmas 1992, and I have heard it quite often in their Ohio home when I visit them. It sounds quite nice indeed, this was music that was very well recorded, and the remastering is good.
Also, there is great music on this set; I happen to like the very least popular pieces, go figure. Some of the instrumentals really ROCK, I say that because they have a hard rocking swing different from the hard swing of some other bands. (Or at least that's they way it strikes me).