We found this Tilmor tractor quite interesting. It is not yet in production as there is still some refinement needed. However, It was remarkably easy to use for row-crop cultivation. I was going pretty fast, but still able to stay "on the row" ...within an inch or two of center without too much problem.
If you like the old Allis Chalmers 'G', then this tractor should be interesting.
There is another similar tractor called the Oggun.
I'd love to hear your comments on this unit.