Actually most commercial uprights are VERY lucky to survive 15Yrs-any brand.Mostly depends on how they are treated and used.Most commercial uprights are junked after only a few years of use.One college out here beats up their Sanitaires something bad.Fans,fancases,belts and brushrolls are the most copmmon victims-and the cloth bags-the school here uses dump bags.One Sanitaire vac from Wendys here had a dead mouse caught in the fan dishcarge opening-the user wondered why the machine smelled bad when it was used-this was from a restuarant!Restuarants are especially bad on vacuums-the grease and food debis mixed with the dirt-VERY hard on fans and fancases.Makes a very abrasive "slurry"and it doesnt blow into the bag-lingers in the fancase-abrading both.