I have this for about 6 months. The big idea to buy this was to have easy way to switch between different configuration. I have windows PC which I use for music and mixing, and also for gaming and watching movies. So when I am working on music, I am using my Audio Interface Focusrite Clarett 8pre USB, but when I am gaming or watching movies - I see no reason to keep my sound card ON. Also one of my big problems was Volume Control.
And here comes the Mackie big knob. This thing solved all my issues at ones. First this device is all metal , great build. It has big and easy to roll knob for Volume, and great buttons for Mute, DIM , MONO, switch A/B speakers and very important for me - switch A/B input. A input is from my Audio Interface, and B input is directly from my PC with 3.5mm connector. Another big plus was that this thing is little and easy to put in front of my monitor. This way audio interface can be placed a little away from me.
After 6 months , I still think this was a great addition to my studio.