A different viewpoint here, the 60" MMM will do everything you need to cut on a flat 4 acres. I just mowed 1 1/2 ac of 3 foot tall weeds with mine and it did a great job. Only the first mowing will be more difficult, After the first cutting you will be able to keep all the grass less than 5" high with the 60"MMM. So, that being sail, I would not buy any other flail mower or brush hog mower. Whey you are mowing use low range and watch the temp gauge, if it starts getting hot, stop and clean the screens and remove any grass blockage, Keep a paint brush in your tool box to brush off the screens. When mowing regular grass it is OK to do it in High Range.