I don't have 12 MacBook, so I got the combo from Apple. Yeah, cost me another $49+$35... But after I plugged in, I could say that this is a no-brainer purchase if you own 12.9 iPP. I can, literally, see the battery level increasing 1% every 1 to 1.5 min while I am still using it. Awesome, awesome and awesome. I strongly recommend you to buy them. Now, I have a question. If any one has a 12 Macbook and 12.9 iPP, can you test the transfer speed between these two devices with a USB-C to Lightning cable?