If this can be made compatible with a PC, I'm going to predict that this is going to be way more popular than Microsoft's adaptive controller. I'm not physically disabled so I can't really see myself using Microsoft's controller, but I can absolutely see myself having scenarios where, even as someone able-bodied, I might want this. Combine that with the controller appearing to be way more capable out-of-the-box at a lower price, and I'm thinking most people would want to go with this one over the Microsoft controller.
Surely it will be. Even if there’s not official drivers - which I’m guessing will happen soon - the community will probably get it going quickly. It’s got to have a close enough interface to a standard ps controller I wouldn’t be shocked if it works out of the box.