It seems to work good for me and I think most other people if you use it right. Get the combine set right, then set the grain loss for four green lights. I then still try to do better to see if I can make any lights go away. If dew comes on and yellow lights come on then you need to change something to make them go away. Never had a problem with it not working yet on any of my combines. .........May not work next time now. Ilnh