I have one and that part of the machine works great. If you have a "bulldozer" header on the front, it is a necessity. After much rains, I was ingesting a fair amount of dirt from ravines. You still have to clear the "dirt dam" from between the MD beater and the feeder chain - boy is that fun. I took out 2 watch crystals doing that. If you don't get rid of the "dirt dam", you can get uneven feeding which will jam the rock beater. If you can avoid this, it is great stone protection and very effective. On the con side, you don't have great visibility on the header knife due to the elongation of the feeder housing. Maybe the new combines will have a shortened version of the feeder house which will allow you to see the knife again?