It looks like this competes with Mos.app[0]. Honestly, I'm not sure how folks use non-magic mice without this.
If you use macOS on a desk setup, I still recommend the magic trackpad over everything else; macOS is just designed around trackpads. It might not be the best for ergonomics, but if that's your concern and you work as a programmer, you should just optimize your workflows around the keyboard instead of the mouse.
It enables reting scaling functionality on any external monitor, regardless of the resolution or the Apple compatibility.
It's great for 2k monitors that are totally hiDPI but are not deemed enough by Apple, and even for FHD secondarh displays that don't need that much display real state so you can use that real state to scale everything nicely.