Nux Mighty Lite BT MKII

My goal was to use it mainly with the Rocksmith or Yousician connected with the USB cable with my laptop as a portable setup.
Second use case would be to have it drive my headphones during practice session.
Third would be to pack it and visit my friends to jam together.

I think it would be good for the part of the second and third use cases.
Unfortunately I cannot use it without the plugged in power supply with the USB connected at the same time.
It does not matter if I try to power it with my laptop via USB-C or have batteries inserted when the USB is plugged in there is a significant noise coming from the speaker/headphones connected to the amp. The only way to get rid of that is either disconnecting the USB (no audio interface anymore) or connecting the power supply with the barrel plug (byebye pure battery powered portability).

Apart from that it is very nice and definitely sufficient for the practice amp.
Is it small enough that you can feel that you can put it in your bag pack and just go? Yes.
Is it plasticky? Yes, but it is quite sturdy.
Would I buy it again? Nope. I need a small amp that can be used with the PC without the AC adapter connected. This one does not check that mark.