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Being in the tractor business pushing forty years there are brands that have a lot of issues with major updates with flat rates of 40 to fifty hours of work and some within thirty days of introduction! Kubota has not been one of those companies that turn out experimental stuff to allow the purchasers to be their guiena pigs!
For what you are doing it would be hard not to look at the B-7800 unless you have tight areas.
I do like the new little B-s as in our hilly terrain the three ranges are a major plus!