I sell original adapters over 2 years, hope these suggestions can help you find the right adapters. First, some words I use. ①Original: Someone call it genuine. Apple dont produce adapter by itself, so they find OEM(Original Equipment Manufacturer). Till now I know 3 companies make adapters for Apple, they are Delta/Liteon/Samsung. Some customers like Delta, they think that its quality is the best. ②Replacement: These adapters also called high-copy, they are made by other factories without Apples authorisation. Too many factories produce these adapters in China, a wide difference between these adapters. Generally speaking, 2 kinds, Grade A and Grade B. Factories in China like calling their replacement as OEM, its not right. I will not discuss Grade B, quality is a big problem in my opinion. ③Refurbish: Like Forrest said You never know what you are going to get. Most time, refurbish means original circuit but replacement case. If you are lucky, the circuit is new not repair. But always they are the broken circuit, people repair them and add new case. I know some sellers in US also sell used original adapters as refurbish, thats better.