I was using this machine actively until recently after purchasing it new. I upgraded the memory and storage through BTO (Build-to-Order), and I think it can still be used without any stress. I am selling it at a bargain price because I closed my office. - Model: Apple iMac Retina 4K 21.5-inch Late 2015 - Accessories: Keyboard, Trackpad - Color: Silver - Keyboard Type: Japanese layout - Trackpad: Apple Magic Trackpad - Memory: 16GB - Storage: 2TB Thank you for looking.