What sucks about sliders is that if you use your rig for a camper, it's hard to get in and out of the vehicle quietly, especially from the inside of the vehicle, You really gotta get the door moving for the momentum to carry it into the latches. And it's hard for a kid or small woman to operate them, especially on an incline. (90% of the time, I only need a door open enough for passage of people, so the extra width of a slider is wasted. Look at most people's camper builds; their interior cabinets overlap the door opening, which supports my reason.
Sliders have their place, but for me, I would choose a barn side door in a New York second, if it was even an option on a Sprinter.