I am going to look at a Earthquake cultivator either tomorrow afternoon or Tuesday morning.
I got one of these this spring for doing some raised garden beds. When I first started with it, I was pretty disappointed as it would stall the tillers quite easily. Couldn't hardly get anything chewed up. Then as I thought about it, figured it had a centrifugal clutch, and maybe just not turning fast enough. Sounded not bad, but took it to the workbench and found the throttle cable loom was adjusted at the shortest length. So I lengthened it out, and just like night a day! Have stalled it a couple of time in really heavy dirt, but overall works really great now. Won't bust sod, but then I didn't need to. Light enough to carry around from bed to bed, so overall, I have been happy with it.