Had the Kasco ones here. Did some spring plowing of sod or alfalfa many years ago. Sometimes did not get all the fall plowing done on time either and this was before a chisel plow and larger tractor. On spring plowing they helped a little bit but you usually still ended up with marbles that you could never get broken down no matter how many times you worked it. Stuff would simply dry out before you could get it all plowed and worked down. Never used the rake in the fall, but am quite familiar with heavy black waxy soil and the heavy red clays.
After plowing in lands the ends would be so hard you could barely get the plow in the ground and turn the stuff over. Big long slabs 2-3 ft long. After a good winter and freeze/thaw cycles though it would be the most mellow and nicest soil you ever saw. | 
A moldboard plowing question - pulling a wire
