So am I, especially since I auditioned the old MDR-DS5000 a few months back and was disappointed by the lack of bass as well as by the the hollow, artificial sound of the processor. Sure hope Sony has resolved these issues with the 5100.

Also, despite what Sony claimed about extra 5000 headphone units being available separately, I was unable to find a retailer with even the foggiest notion, nor did I find a part number or price at the Sony site. Now I see at the link mentioned in your "Sony press releases..." thread that the headphones are again purported to be sold separately. Please confirm in your review that additional headphone sets (MDR-IF5000) will indeed exist. :^)