Have to agree with Cliff - One of the keys to disc cutters is sharp knives. If they are kept sharp they will slice just as well as a sycle. Looking at used disc mowers at dealers shows very poor maintinance of knives. I dought there would be two days regrowth difference if both cutter heads were in the same condition - same condition dull or sharp, regrowth would be simular. I've seen sycles and rock guards that are worthless due to poor maintinance and do a tearing job at the grass and alfalfa. Maintinance is key to top management