For what it's worth, I have about a 2 acre pen I keep the horses in when I need them off the pastures; this spring I wanted to re-plant everything because it had gotten too many 'native' grasses/weeds in it. Anyway, the first time I did it I shortened the top link so the box blade was tilted way forward (kept the blades off the grond), then I put all 6 scarifier teeth all the way down, dropped the 3pt to the bottom and made laps around the pen...back and forth like tilling a garden. Then I went back and did the same thing except perpendicular to the original passes...this broke the ground up really nice. Then, I waited a couple of days (it rained, and I had to let it dry) and went after it with a chisel plow. Not sure what other names this thing has, but it is basically a cross between a cultivator, sub-soiler, and scarifier from a box blade; except, at the top of each shank, there are two large springs. The tines on this thing will dig (about 18 inches if you let it) deep and they springs let them bounce back and forth -- It really pulverizes the ground. Finally, a few passes with the disc and it was nice and broken up, the weeds were gone, and the it was nice and level again -- no ruts from putting out hay in the winter when the ground is so soft.
I have done this same area with a tiller and I think the grass is much better now than it has been in the past. I don't know if it's becaue the ground was worked deeper or if the soil is just better now from an additional year of fertilizer and seed. With the tiller it takes about the same amount of time as if I use the box blade, chisel plow, and disc. But, it seems to take F O R E V E R with the tiller b/c you're moving so slow. With the other attachments you can move much faster. I have to use this same method in the fall on 18 acres...I definitely would not want to use a tiller for that.