I have the same tool and I found it works ok on the side edge but not the base edge. When I used it once on the base edge it even scrap off some base material on my board so I stop using it on the base.
use it for the side edge. It sucks for the base edge. The number printed on the tool. If that is facing the edge that is the angle you are cutting. I like to use this tool for the side edge and the swix 2x2 for the base edge. The swix 2x2 also comes with a diamond file insert that you can pull out and use it too remove the burs like demonstrated in the video.