Bill and I (Dick) do certainly have a vested interest, but after hearing a lot of digital product over the years, the Tambaqui is what I refer to as a gift to the audio business. It's that good! And for a price that is a great deal lower than its performance would indicate. Thank you for your comment regarding folks that "buy with their ears" will walk out with the Tambaqui. I couldn't agree more!
As a matter of fact, not only have we heard the Grimm MU1 but recommend it as the best streaming device currently available to put in front of the Mola Mola Tambaqui DAC. I would echo your sentiments that this combo could very well be a "stack killer."
I am a dCS fan, but the Tambaqui sounded really excellent at Axpona. Bruno Putzeys is a superb designer.