While they may seem to be identical and "perfect" knockoffs, I can guarantee that they are not as perfect on the inside. They all use crap components and bridge a lot of "unnecessary" components on the pcb to save on each unit. It would take a lot more than my 10 fingers to count the number of melted and deformed chargers that come in to me that people bought off of ebay for $10. Spend the money and get the real deal. Especially when diagnosing boards.