Pinsound is extraordinarily important on some games. I believe the Shadow mix has some callouts from the mix (better sounding clips basically) and a better soundtrack. Those 2 changes do make the game feel more modern. as was stated above, the sound is more effective / immersive for when you're playing, the ColorDMD is for showing off the game. Again, not all games benefit greatly from PinSound yet. CFTBL, Indy, JP, TZ come to mind. later WPC95 games - don't even bother. Just get flipper fidelity and you're done.