Suppose, for a moment, that you went out and bought a new car. According to the sales person, as well as the owner's manual, when it begins to rain, the windshield wipers automatically come on, without you, the driver, doing anything. Only, it doesn't. So, you take it back to be serviced. The technicians fix it, but, a couple weeks later, it is dysfunctional again. The techs don't seem to be able to diagnose and fix the problem.
Would they take the car back and give you a brand new one? I think not.
With a Xerox printer, you get a "CED" (Customer Expectation Document) that spells out everything you can, and, can not expect from your printer. If your machine is not within the specs as outlined in your CED (color quality, speed, alignment, etc.), and, the techs can not figure out how to fix it, they are obligated to pull and replace your machine. This is not just a sales spiel. I know first hand. They just, within the last couple of months, had to replace one of our Versant 2100's because they could not figure out an alignment problem that kept cropping up. Last year, they had to replace one of our Fiery EXP Hyper Rips because of an intermittent power problem.
I don't know how other vendors operate, as, we are an all-Xerox shop for color. Primarily because of the service, and, the way they do business.
Full disclosure: We are not affiliated in any way, shape or form with Xerox or Fuji. We are a print services provider.