I have a MX5100 and I will not use an 8' cutter on my place. It sort of depends upon what and where you are mowing. The heavy duty rotary mowers, ie. Bushhog, Landpride, et. al. are heavyweight mowers and on hillsides, particularly with heavy brush, small trees, etc. are too much for the 5100. It will pull the mower, but even with the FEL and HD bucket it is light in the front end. Level ground with grass and light brush is a different matter. If you are for hire you are going to get some rough ground to mow. You can decline it of course, but if you are looking to make money I would go with a heavier tractor. Actually, I would prefer an older, used tractor for commercial mowing, look at what they are using on the highway right of ways. I love my 5100, but that's not what it's built for. As to a finishing mower, if you are going to be mowing lawn type turf a zero turn would be your best choice, it's much faster and a better cut with less weight.