I have the Sony box ("The Genius of Electric Guitar"):
The selection is great (including alternates and some neat rehearsal tracks), the sound is--for the most part--great, and the booklet is well-done. But BEWARE, the packaging SUCKS. As is well documented, the CD's are placed directly into slits cut into a block of foam rubber, which practically guarantees that residue gets all over them and potentially screws up how they play. But not to worry, all you have to do is call the toll-free customer service number Sony provides in the booklet, and they'll replace the CD's with brand new ones. Needless to say, you'll then want to store them in jewel cases.