At work we use Motu M2's to drive one of our products, and I needed a cheaper device with good sound quality to give to my test VMs (via PCIe Passthrough) and feed each VM's output into a Motu 16A. We bought four of these, and I just set up the first one. It seems to sound/work quite well. My only gripe so far is that whenever the device has been idle for a few seconds, there's an audible pop before any new sound is heard, which slightly cuts off the beginning of the audio, and then another audible pop a few seconds after audio has stopped. I haven't had this issue with a spare Motu M2, nor with an assortment of USB to 3.5mm adapters on the same setup, so I think I can safely attribute this behavior to the device, rather than my VM setup. I don't have time to fully build this out and test each one yet, but I did try a few different sample rates and bit depths on this first device, and it happened in each combination so far. I also have USB selective suspend disabled in the OS, and I verified that all USB root ports are set the same way within the VM as well. I also found that this happens with automatically detected Windows drivers, as well as with the SMSL provided ones. I'm sure I've heard of this happening before on other devices, and I would imagine this is something that can be fixed with firmware updates? Once I have time to test the others and set them up in the 16A (which admittedly may not be for a week or so), I will report back, and hopefully with recordings of this behavior as well.