Well today I cut 4 different lawns. The first one I came too was a part time house and the sprinkler had just came on The st.augustine was 6inchs tall I cut it down to 3 1/2. It was so wet. I looked at the underside of the deck after I was through. I had about a quarter of an inch of build up on the very front of the deck! I went to the next yard and it was very thick too I was bagging it. 5 inches tall st.augustine. A few areas were not as thick. I looked under the deck and nothing! other than the build up by the spindle which was there from day one. it stays there. I went to the next one which was thin st.augustine and once again no build up. I then went to a new property which had new sod from like a month ago. It was like 7 inches tall! I was side discharging. The tiger cub ate this for breakfeast It was so smooth the first time so I didn't even have to double cut which I never have to It is always one pass and your through. I looked under the deck And NO BUILDUP!!!!! Sorry I just love this mower so much and recomend it to anyone who is looking in to a new mower.