There is certainly value in any DC headset. eBay does a lively business in them. I have bought and sold DC passive headsets on eBay myself. Indeed, my ship is equipped with three of the venerable H10-13H for pax, all bought used off of eBay.
My headset is a DC ONE-XP. I love it. Just a tick behind the Z3 and A20 in terms of ultimate noise reduction, but only a tick behind and a worthy trade-off to get that DC ruggedness, reliability and service. The dual swivel on the earcups makes them more comfortable, too. Plus the XP version, with a couple of adapters, will fly in any civil aircraft and will automatically select battery power if needed (the A20 can do that, too, but not the Z3). If you are not flying a helmet with CEPs I can highly recommend the DC ONE-XP.