I have a S105 Woods ditch bank cutter and love it. I bought it at a farm auction for $200. I pull it behind a Kubota
L4240 (about 6-7K# with loader and filled tires) and have no problems with it being too heavy. Mine does not even have the tail wheel option like the one in the picture. I have 400 pounds of suitcase style weights on the opposite end and it balances it out really well. I cut the banks of my ponds. It also works well for cutting under branches near tree lines and cutting near fence lines because you dont have to get so close with the tractor. It is by far my favorite implement. I am a mechanical guy so all of the drive lines and gear boxes fasinate me.
If anyone needs any more info on it let me know.