My property looks similar to yours in some places. I went with Novatractor because it had the meanest looking hammers I found. I was telling my wife we need to take better pics and video of what we're doing with it because so far all I find online is people just cutting grass lol. This thing eats twigs, small branches, saplings and pine cones like nothing. This was 15 minutes and was easy stuff compared to some.
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Also, the sideshift has been great! I have the MFZ155, my tractor is 66 inches wide. So it's 60" cut doesn't quite cover the tires but I didn't want to go wider because it can be tricky to maneuver between the trees. The sideshift lets me reach a little as well as letting me get it out of the way when turning or up against the fence line. I am glad I went with a slide model.
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I was a bit leary about getting one that seems almost nobody has heard of, but they've been on the market for at least a few years so hope they will be around when I need something. I do have a few spare hammers. And as I saw someone else mentioned, the back panel on the Novatractor opens up for inspection and maintenance and makes it much easier to deal with.