In all seriousness, they said that one would notice in improvement in optical sound, honestly.
Whether this is true, remains to be heard till it arrives. One thing you might be interested in is, out of curiosity, I connected my Harmon Kardon 31 DVD player as an experment to my Denon receiver using 2 good analog cables I had bought from Paul PCI & listened to a CD via headphones & also compared the same CD via my optical connection. I did not use my speakers, as I figured the sound from the headphones would be a less biased flatter type sound. For terms of expediency, I used the VCR input on my Denon receiver to hear via analog & the DVD input to hear via Optic cable. If those inputs affect the sound quality in any way, someone please let me know because maybe then the outcome was affected. I'm assuming all inputs are the same but obviously need to be set for either digital or analog connections. Anyway, the sound from my optical cable was much stronger & better then my analog connection for this particular DVD player connected to the Denon Receiver.