I have most of the major brands in my shed. I don't particularly care much about what colour I'm using. Purchases have been made based on cost, which has included some green equipment when a great auction find has been found.
My experience says that JD has the UX nailed. When you're spending 12 hour days in the seat, the little things do start to make a big difference. I am not sure it is fair to be dismissive of it as being a result of great branding. The equipment is meant to be used and the experience and comfort while using it can most definitely be worth a premium to many.