I have not planted rr soybeans before, but I don't mind spending the extra money for the duel. I really just want a perfect field, on a spring planting. I've had good success plantingfall clover plots w/perrenial rye mixed with it. Last years spring planting was a mess. That nut grass came up thicker than hair on a dog's back.(3 acres of soybeans & alphalpha) You really don't think I need the duel? My experiance w/ roundup is that it doesn't always do the job 100%, plus nut and coffee grass are one of the hadest weedsto control.(at least in Jersey)