In the marketing, they have to dance around not saying the current production sounds different, but IME, an old Seymour-wound JB/Jazz or the 35th Anni JB/Jazz (and presumably this 50th original recipe) vs a modern production JB/Jazz do sound or respond slightly different. The old JBs don't have the overly-prominent high peak that people complain about (ice-picky), and they also clean up with the volume. The old recipe neck Jazz also is more 'toneful' to me (if that's a word), e.g. it has something warm/thick/chunky in the low end without getting boomy and has plenty of treble to stay clear at the same time. It's fun to play.