I never give much credence to professional reviews.
These guys are all friends with manufacturers and have a common interest in hyping up products.
If you listen to them, there no inferior products in hi-fi.
As for the MU1/MU2.
I spent some time with both, not really impressed.
I have to admit their DIY-like design turned me off right away.
They slapped inside a NUC-i3 for god sake, and even brought out its tiny power button (yes, button, not a switch) to the back panel to serve as a system power on-off switch.
As for the sound of both MU1 and MU2, its is coloured, with midtones exaggerated, the overall presentation is brought forward and heavily weighted towards the center of the soundstage.
There is no 3D imaging like you get with HMS/DAVE.
Yes, they do sound less harsh than the DAVE on its own, but so probably most DACs out there.
The web interface is primitive which is probably an indication that the products where rushed to the market.
All that said, their coloured sound might appeal to a sizeable population who like this kind of presentation and do not care about engineering aspects of design as I do.