I use this device in REAPER.
The reasons I wanted this is that I wanted to save time with mixing, by preserving creativity without using the mouse too much or doing repetitive tasks.
I also wanted more buttons for VST/send control and a motivation to apply more automation into my music.
The build quality is pretty good for this price. It has rubber on the bottom to avoid slipping, which is nice.
The machine is very easy to comprehend at first use.
The only con I have (because I use REAPER) is that panning doesn't work in the first factory template (which has 99% of the functionality) because of the HUI intergration.
But this minor issue can be worked around by assigning the pan knobs in the other factory templates or user templates.