I was able to stop at the THX both at RMAF last year and heard both of the circuit amp designs and I spoke with Tim Dick an application engineer from company and heard 2 amps with these amp modules in tiny plexiglass boxes with external PSU's. I asked him then when would these come to market and he mentioned the Benchmark product and I asked anything not in big buck league. Tim said Monoprice would be coming out with amp next year. I was throughly impressed with this amp design but waiting till Novemeber seems like a long time. I prefer that their is no DAC in this unit and it have more power and fully balanced output to power those power hungry headphones. Lets be real what can you buy for this price point with this kind of power and design. I think that might be worth putting out $350 to see if Massdrop can excute a simple built highly engineered amp. What would be some power supply options for this unit? I do remember they had a nice mix of high impedance headphones and harder to drive ones and being blow away that a tiny boxed circuit could power all these headphones and sound very good. I would like to hear this unit before I buy also . I think I would take this over the Cavalli Liquid Carbon Massdrop version. Here are my thoughts on what the amp design sounds like.