I would take most any seller’s expressed point of view with a grain of salt. Many reviewers have stated they feel the MU2 is better than the MU1 (or any other comparable server) paired with very expensive dacs, and have told me (personally) that may store owners (in private) felt the the same way, but of course in the case of the latter, their livelihood involves selling SOTA dacs... It seem Grimm is on to something very extraordinary in their technology. Heck, for some the price of a digital cable and power cord is more that the price difference between the MU1 and MU2.. LOL!
Grimm MU1/Mola Mola Tambaqui combo vs. Grimm MU2
Here is a great video discussing the very popular question of which is better: the Grimm MU1 streamer with the Mola Mola Tambaqui DAC or the Grimm MU2 with built-in DAC?