I use it on a 27", probably all depends on the distance of the screen where you are sitting. I did a test, at 1 meter it works very well, at 1.30 meters sometimes it doesn't see the face, so probably if with a bigger screen you go further there can be accuracy problems, if you're at 1 meter no worries.

I'm using it on a 34' in 21:9 format and the tracker works very well, but there is indeed a small loss of precision in the angles.

I use it at a "desktop" distance, about 70cm I think