I was very excited to get this as a replacement to my 2014 Mac. It had great specs and a very reasonable price. I bought the "good condition" model from All Out Apple. It arrived a day early which was a nice surprise. It was only adequately packaged with no bubble wrap or moisture protection -- only a wrap around cardboard box that fit it pretty well. It came with an authentic Apple charger, had only a minor discolouration on the shell where the previous owner had a kept sticker, and had a battery cycle count under 300. It started fine and ran a few updates. After that, the problems began. It would shut down the second any peripheral was plugged in. And a "panic medic boot" sign came up repeatedly. Then it would take 4 attempts to restart it before getting going. This continued for a very long day during which I kept trying everything I could think of to clean it up. Finally, under recommendation of the seller, I wiped the drive in order to reinstall the OS. That took 4+ hours and looked like it might work. Then the dreaded error code 2003F came up. I did the whole process again. Same result. Again. Again. It was stuck. In the end, the seller took it back and refunded me within a week. But it was obvious that nobody ever did anything other than power up this machine to check it for problems. I hope it got fixed, but it should never have been shipped to me. So, be ware and buy at your own risk