I've looked at one of these for years, but this season I splurged and bought one. A Hoss Tools single wheel. This thing is fantastic! I can clear the middle of the rows quicker than with a rotary tiller, no gas, and no bucking. I can see it not working as well if the weeds get large or the ground is packed down and dry.
Does any of the other gardeners here use anything like this, and what had been your long term experience with it?