Summary: This is the first product review I've written - that's how upset I am!!! My unit is two years old and already broken two belts. As to the belt coming off the pully, Samsung issued a service bulletin recommending replacing the pulley. Part number DC81-00220A. When the drum is turned counterclockwise, the belt will jump off the pulley. What a piece of junk.
Summary: Had this dryer for over a year now. We're at the point where we have to re-seat the belt once to twice a month. Read some appliance forums where others are having the same issue. It took over 10 years for my last dryer to ruin a belt. I would seriously look elsewhere.
Summary: Bought this unit in January and by June we had more than 8 service calls to fix the dryer. This dryer was a fire risk and ruined two loads of clothes. This all started because the dryer would not shut off on the Auto-dry cycle, it would cycle down to something less than 20 minutes and then reset to 40 minutes, continue to heat and dry.