Cat:
I know that the Kubota B7500 doesn't have a float setting for the rear 3-point. If there isn't an easy way (relatively speaking of course) to adapt the valve system to make a float setting, what's the next larger size Kubota that has a float setting on the 3-point? That's the biggest drawback that I can see to the B7500. It's hard to use a box scraper without the float setting.
Maybe someone else can chime in on this, but I'm not aware of any 3-point hitches with a "float" position. To have a true "float" position, the hitch would need to have downward pressure.
Some of the larger tractors do have a "draft" position, which is mostly used for plowing fields. This allows the implement to raise and lower based on the pull. For Kubota, I think you need to get up to at least the L4400 and the M-Series before that is even offered.
It does take a fair amount of practice to use a box scraper. I know of several people who have put hydraulic top links on their tractors. This allows you to manually tilt the box scraper, from the seat, as you are grading. To do so, you would need to add a "power beyond" option and controls to your hydraulic system. It is not difficult. Your Kubota dealer should be able to assist you with the parts.
The B7500 is a pretty good little tractor. If you don't need to go bigger, it will save you a lot of money, fuel, and the eventual service of a much bigger machine.