Grace Design engineers and makes excellent gear but 1) someone already mentioned the use of a micro USB input which is less than ideal and 2) it's manufactured in China. The latter isn't a deal-breaker but I do wonder how much more the SDAC would be selling for if they actually made it in-house at Grace in Colorado? That said, the specs appear to look good and the price is definitely right. Would love to see how this stacks up against the Schiit Modi 2.