It worked beautifully for me. Our driveway is 300' long, and something less than 1/4 of it is built on a pretty good grade. That part in particular needed attention after heavy rains. It would wash from the water on the parking area uphill from it.
The drag is made from two 5' pieces of 6" wideflange I-beam. They are bolted together with 6 pieces of 1/2" allthread, double-nutted to maintain the spacing. The one beam has four holes to hook the chains onto - 2 above and two below the web of the beam. This was to adjust the aggressiveness of the cut. The two chains have grab hooks and attach to the drawbar. The material it moves can be regulated to be cast to the right or left by hooking the two chains at unequal lengths if you don't want to drag it straight. The lift boom allows it to be picked up for transporting and turning around (first tractor didn't have a 3PH and it was difficult to turn around without dragging material where you didn't want it).
Since the repair links I used to attach the chains to the holes in the beam have rusted, I just flip it over for more / less cutting action. With the chains low on the beam, it will dress up the sand without building up a big pile in front of the beams. Hooked higher, it digs in pretty good.
Right now it's at the home of a friend a couple counties away who used it to level his lawn. Years ago he had a garden that was abandoned and really uneven. He rented a tractor with a 3PH tiller and worked up the soil, then used the drag to put the dirt where he wanted it and get it smooth. He told me it worked well for him.
Best part is the material was free except for the chains. Someone on a project I was working on mismeasured the beams for supports on a rooftop HVAC unit................chim