I ordered both the MicroMix 1 and MicroMix 2 as replacements for the legendary Behringer Xenyx 302 USB which I used to love mostly for its size and routing options, but has been discontinued.
This is obviously targeted at the same audience and I suspect there was a certain amount of plagiarism when it comes to design and possibly routing schematics. But yeah, that's cool with me.
One major selling point for the 302USB was the fact you could plug a average consumer-grade headset (like your standard gaming gear) into it and use the 3,5mm microphone in.
This is however not possible on either the MicroMix 1 or 2 as the circuit board does not feed phantom power to this port (well, on the MicroMix 1 it does but only for a few seconds after pressing "phantom"). This makes the 3,5mm mic jack only usable with active or pre-amplified microphones, and it kind of defeats the point of having this unit to be honest. I thought this was a fault on my units but Thomann customer service confirmed this was working as intended.
I should add that the preamps are very noisy, but that was to be expected considering the price. Maybe a FetHead can help you regarding this point, but if you're looking for a quality signal you're probably better off looking at other more expensive (but still small) interfaces.
Unit build is metal, solid, knobs are well tightened. The kind of gear you can just stash in the bag with no protection and expect to work for a couple of years.