Yes, I have. Using the M2Tech Hiface vs the stock USB there is a difference. It is not night and day but I hear a clearer separation of instruments, more life-like tone of the instruments and voices, and it will pass through 192K if you have any high resolution downloads. I recommend it, especially for the money. It has had some bad press lately with people complaining it wouldn't work with their DACs, etc. It has never failed to work for me. At this cost, it is a no-brainer for me. I have used both the coax and the BNC connection and to me they are identical.
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