Brian, The chopper is all that I hoped for and more. We added the chopper, put new thresher bars in, removed the reversers and replaced them with the most worn of the thresher bars, and added the 3rd helical extension. Machine seems to use less power than before. We're still just running the chopper with the concave knives fully retracted and it works great. link is to a pic of the chopper in action this evening. Wheat is making somewhere around 70 and as you can see, it's not leaving much straw on top of the stubble. Ed in Montana