A friend of mine is looking to upgrade from a 256GB MBA to a 512GB or 1TB MBP because he needs to view medical imagery offline (the Retina display also helps).

A friend of mine is looking to upgrade from a 256GB MBA to a 512GB or 1TB MBP because he needs to view medical imagery offline (the Retina display also helps). <= 128GB storage is not really adequate for people who work with photos or music. 256GB is better but many people do need more.