I had my mk2 updated to the 3.7. It is better in every way. You need a revealing source to hear the true potential of the improvements. I switched from an Oppo BDP-95 to a Computer source --> REF Link --> DAC with ST fiber and was totally blown away at the difference. The mk2 was excellent. The 3.7 mod takes you that much closer to real life. Definitely worth it. Also, I must add, in my set-up, the ST fiber provides a more lifelike and detailed sound than the other inputs.
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