Off road, I typically only wear mine in extreme off camber situations or on gnarly hill climbs where a roll over is possible. Otherwise I'm with Ian...I'm normally wheeling at under 5mph in the rocks and prefer the mobility...at least until I could get some proper adjustable 5 pt harnesses - the Nissan belt just gets tighter and tigher until you find you can't breathe anymore.

As for these people not wearing belts....after an 800 ft roll I doubt there was anything left of the vehicle...think of it as being strapped into a beer can...if someone stomps the can flat, whether you're belted in or not, you're still gonna get crushed.