Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do buy this for great music, but not for sonic upgrade

Everybody should know by now how great these records are. I own the Discovery-issued of each, and bought this on the promise/assumption of better sound...I personally don't feel that the sound is better. In fact I don't believe I can discern any real difference(s). If you own the earlier issue, you might still buy this to satisfy your curiousity, and then I suggest doing the right thing: give it away to turn someone on to this great music.