I've just finished reading all 146 pages of this epic and interesting thread. Based on the information I think a flail mower is exactly the solution to my mowing requirements. I own approximately 30 acres of mostly open ground. Some of that land (about 9 acres) is in the Conservation Reserve Program which means mowing twice a year at most. There is some quite tall bluestem and other native grasses on that land. Some of the Big Bluestem is taller than my tractor. Approximately 5 acres was finished mowed by the previous owner using a riding lawnmower. About 2 acres are woods and will not be mowed obviously. Finally, there are two fairly large ponds that together use up about 3 acres. The remainder is in well maintained pasture that was mowed fairly regularly using an old rotary cutter. The finish mowed area has quite a few widely spaced trees, some of which will be a bit difficult to get under with the tractor. There is really no heavy brush to speak of. There are, however, some slopes. Only the two pond dams have any slope of significance, but the previous owner mowed those with his rotary cutter and a Kubota L series tractor so I don't expect there should be any issues with using the flail and my tractor on those slopes either.
Judging by what I've read on this thread, I think my needs would be well served by one of the Caroni TM1900BSC units. A golf course appearance is not something that is important to me. Quite frankly, the lawn doesn't have that appearance now with the previous owner's John Deere 500 series lawn tractor. My tractor has 42 horsepower and about 33 PTO horsepower. It is equipped with the three range hydrostatic transmission. Cost is a consideration, but so is quality. The Caroni seems to be a good balance of cost and quality-bang for the buck so to speak. What says Flail Nation? Any and all input would be appreciated-including suggestions of other makes and/or models.