I have an Eliminator prop nut on my Minn Kota now, but I have not tried it yet. I'm not sure how much difference it will make, but the technical reasons seem sound. The issue is I don't know if it will be 1% quieter/smoother (virtually no change) or something worthwhile.
If you do get one, absolutely follow directions in NOT lubricating the o-ring. The grip of that o-ring against the back of the prop is all that prevents the nut from coming loose, so it counts on that grip to work. In this case, the o-ring is not attempting to seal a joint, so no lubricant is desired.