I bought this power supply as I didn't have enough money for the official Apple charger and it seemed like a good deal. I now wish I had waited and spent the extra bit of money on the proper one as this gives terrible interference noise whenever my laptop is connected to any speakers. This interference is also picked up when recording anything into the computer, making the recording completely unusable. However, it's alright if your never going to be connecting your computer to external speakers, and it does seem to be quite solidly built.