Because the material for both the walls and the roof is better quality, the zips are a dream and the poles are lightweight and fit together easily. Worth the money? Depends how often you are going to use your awning. Once a year on the Isle of Wight - probably not. Regularly throughout the year at home and abroad - certainly. Now the really big question, can you afford it? I'd love an Isabella but the price tag is too high for me.