There are often new codes when one Monoprice code expires, one that may work today is "HOT" where the "SMORE" is now expired. It seems like a deal at $170, but I'd need to pair with a balanced DAC that has either simultaneous or pass through balanced out, so I'm still considering. I have 2 balanced DACs, but none with pass through yet, and the pops / build quality on the SMSL D6 at $170 is still holding me off from getting that one. Since this model is now 2+ years old, it is surprising it hasn't been highly surpassed in specs (even if inaudible...) by other Drop, Topping, or SMSL, etc. products? Or perhaps it has been?