He concluded that the Grimm MU2 is very good and a winner for the price. Given a high-resolution system, the Grimm MU1 with a Mola Mola Tambaqui is clearly better. Both are extraordinary values, but the separates in this case are simply better (MU1/Tambaqui).
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?