I rather like the Greenfield design concept, provided the mower is intended for someone who won't be doing a whole lot of tight manoeuvring, will spend a lot of time at full mowing speed, and needs to run the machine for years on a tight maintenance budget (probably doing the work himself/herself). On the other hand if you are going to spend your time backing and filling in a tight work area around obstacles, or constantly stopping and starting on steep hills, or towing something substantial up steep hills, I think it would be way better to use a hydrostatic machine (specifically, one with a hydro unit that is field-serviceable).
Having said that, I've never tried to earn a living that way, so my opinion is even more worthless than usual.
