At first, the Mac Studio would not allow the O/S to be downloaded and installed. "cannot install, please try later". Also would not allow Tahoe to be installed from a USB stick with Tahoe installer on it. "cannot be installed on this device". I almost sent it back as faulty, then I tried to delete the partitions on the hard drive entirely (which worked), and then the Apple servers allowed the Tahoe download (took 3 hours) and Tahoe installed OK and I was able to link the Studio to my Apple account. Lose one star because the Studio was delivered in a state where the O/S could not be immediately installed and it took me several hours to figure out what the supplier had done wrong. Someone with less experience with computers would believe the Studio was faulty when it was just the supplier had left the old partition in place. The Mac Studio itself was in its original Apple box and is immaculate, and all the ports work fine.