Amazing purchase. I was concerned it would not be of excellent quality and it most definitely is. After almost a week of using it every day I can say I adore this machine. The smoothness, the battery life, the quietness, the quality of the screen and most of all how the keyboard displays all of the information related to what you are doing. Why buy a new ridiculously expensive machine when you can buy this work of art. I updated it immediately to OS Sequoia 15.1 all works perfectly. I buy so many things on Amazon but this is the cream of the crop