The retractable fingers aid in feeding a great deal. The Cat header is a very good header. The 3D sieves also work very good. They allow the combine to harvest on up to a 20 degree side slope and still keep an even mat across the entire length of the sieves. The electric sieves, however, have nothing to do with the 3D sieve system. They allow you to adjust the sieves from the cab without having to get out. This is very convieniet because then if you see a problem in the tailings return or in the grain tank you don't have to get out. Every adjustment to the machine can be made inside the machine.