I had a problem with it with it at first. It was locked and owned by a school but I bypassed that and updated it to the newest version! macOS Seqauia! ITS not laggy the fan does come on once in a while no BIGGY . It’s actually really great. ALL THE KEYS WORK, volume is great, Camera works, and has some scratch’s on the exterior but that’s normal. Literally amazed for a cheap price just until I save enough to get the one i actually want! 😊.