I was thinking selling the 800 for the 800s and add the Wireworld cable, but the total out of pockect was a lot and I figured that the signature was near the same, I may still get a new cable.
Also Senn has a program I think it runs about $350ish for the HD800, you send it in, they completely rebuild them new drivers and new pads etc. They wont swap or let you pay the diff for the S model
OH Well I still like them, I have little issues either with the treble with my Woo tube amp.
PS I did get a different brand to complement my lineup of Senns I own
All in all if I was going to get new a 800 model I think I would lean towards to S model.. Is suppose to have a little more punch which I feel is lacking a few db is all i in the lower than 100 Hz ranges