Not sure about soybeans in particular, but generally I have had good results with any hi-inertia cylinders I have installed. As I said in the walker maintenance thread, there is a gain in capacity simply due to the cylinder maintaining its threshing speed. Dust vibrations are also a thing of the past because the cylinder is sealed. (No more dust on the back of the rasp bars) This also is easier on the variable drive belt because it does not get the shock load of sudden cylinder speed changes. The only drawbacks would be initial product cost, installation time/cost, and you can't inspect your concave and beater by looking through the cylinder anymore.