I have purchased many v-belts over the past few years for V-belt guys and been satisfied with the belts that I have received. I was originally hesitant to buy a generic belt instead of a name brand. I have only had a issue with one belt out of the many, possibly 100 to 200 belts I have purchased, but that was partially due to an excessive span issue. I was able to correct the issue by purchasing a Kevlar reinforced belt from them and no longer have the issue with the particular machine. with out changing the belt cover or adding an idler pulley