My B7500 doesn't have position control - so what? All it does is return the implement to exactly the same height whenever you raise and lower it again. The same thing can be done by using chains or by eye. I'm pretty sure I can tell 3" from 4" when I'm 4' away. Besides, position control maintains the implement height in relation to the tractor, not the ground. So, if the front tires go up and over a bump, your implement is going down into the ground. Front tires go down, implement goes up. What I'm saying is that even with pos. control, I would see myself staring over my right shoulder and making constant adjustments - much like I do now - except for maybe the last 2 passes when everything has been brought close to level. And since there are only one or two passes left, is the pos. ctrl. really necessary?
I don't have it and it's not something I wish I had. For those that do have it and use it, they probably wouldn't get another machine without it.
One thing is for sure though, if I had the cash, there wouldn't be much sleep lost over trying to decide between a B7500 and a 2710.