the cts has a spike tooth separator while the lexion has a saw tooth separator causing the lexion to be far more aggressive. in hot conditions the cts does not overload the sieves as much. had to put john deere cover plates cut down off a sts in the lexion in order to reduce sieve loss. having said that you still have to put covers on the cts but they are made for it. mostly a problem for canola or hot (40oC) days in wheat. i have a 470R and have just bought a cts11 to replace it. i understand the deere it has a larger sieving area in relation to its separating area. when the deere breaks down i can get parts and they are cheap. the lexion has expensive parts that have to be flown in. the 470 is a bigger combine 20% but i don't care. for four seasons i have spent at least a week waiting for parts in good harvesting conditions. my cts11 at 3100 sep hours is in better condition than my lexion at 1400 hours. everything in a deere was made to be there and fits like it would from the factory not just brought off the shelf and put in later. my new motto is always buy desirable saleable assets. don't just buy something because it does an extra 25%. i have been burned.