The beauty of this mod is it can be easily restored back to stock, if the person who want's to buy it prefers higher jitter and noise. It's almost like changing out a sound card in a PC. Or changing wheels on a car. I suppose having it done by Lukasz would have a better ring to it though. But who knows what he would charge.
I would not buy a used dac that was hacked on. and I would never sell one and not disclose it. a catch 22.