In certain parts of the country where straw stays green, or humidity is high, weeds are a factor, walker machines out shine the rotaries hands down. It is for this reason leading combine manufactures still produce walker machines. New Holland, Caterpillar, Case IH, Massey Ferguson, Gleaner, John Deere world wide probably produce more walker machines than rotor machines. It is true when a crop is very dry and easy to harvest like soybeans or corn the rotor works good, but when wheat is 3ft. tall and flat on the ground with green weeds coming up through it give me that conventional walker machine!!!!!