I bought Quantum Fusion X three years ago; both Main and a 155% #1. These sails are used every week and the main is left on board. Just last week one of my neighbors asked me old are those sails...3 years old...no way, they look almost brand new. I will say they are in incredible shape as there designers intended. The cost for a Dacron main was $3,000 and the Fusion X was $4,100. I specifically bought Fusion X due to it's ability to hold shape and the projected life of the sail.