I purchased this to have a third sensor for roomscale tracking, as recommended by Oculus.
To be honest, I was achieving pretty good room scale with just 2 in opposite corners. There was no noticeable improvement with 3 besides eliminating a small blind spot in one corner. Would not say it was necessary.
Just bought a 3rd sensor for Room Scale Rifting. Very happy with the result. The 3rd sensor allowed me to position the original 2 in the corners of the room just below ceiling height and the 3rd at about shoulder height behind me in left corner. It all works great, no tracking faults.
The sensor is perfect and looking forward to setting it up. Only negative is the repeater cable is only a USB 2 which won’t work as well as the sensors come with USB 3 so it will seriously hurt the performance.