Curious how this DR mower would stand up to use. Looks almost more hobby farmer than for use on mowing miles and miles of fence. Also if it can take down thick grass that you might get to once a year, not the 2 or 3 inches of green grass that is shown in the video. The trimmer head that holds the line looks to be plastic?
It looks like the same head they use with their walk-behind string mowers. The ball lasts for years with heavy use, even though it is some sort of plastic. With the heavy cord they cut small saplings, as long as you get them the first year and don't let them get woody. Woody stems over about a quarter inch in diameter generally break the strings unless you ease into them very gently, and even then quickly shred the strings.
The walk-behind units cut three-foot grass and weeds with no problem. But on this one I wonder how the round shield that steers it around the fence posts works with tall stuff, since the string is actually under the shield. I'd think it would bend over taller weeds and make them harder to cut.
Terry