I upgraded the processor from 1.6GHz Dual-Core Intel Core i5 to 1.8GHz Dual-Core Intel Core i7, upgraded the flash storage from 128GB to 256GB, and it is a 4GB 1333MHz DDR3 SDRAM version.
As a matter of fact, this MacBook Air is a huge saving. Without a doubt, the 11-inch MacBook Air is the cheapest laptop available from Apple. => saving money.
The ultra-thin, compactness design => saving storage space, carrying space.
The super-lightweight => saving on weight (energy required to carry it.)