We run Marlins in both of our 1688 with specialty rotors,we would never go back to the IH impeller blades.There is no more growling noise when your in tough straw,I think it is well worth buying them.We harvest Hard red spring wheat,Peas,Canola, and flax with them and never had any problems.I know they work well in tough straw and grain because we will start in our wheat at 18% moisture and they work great,we all ways had that growling noise with the IH ones,hope this helps you out.