Bought without an operating system, because I want to work with Win 7. Before and after installing all updates and original drivers from Lenovo, the notebook needs about 1:30 min until the appearance of the desktop (as if no SSD installed). In addition, the fan runs constantly. Test manner upgraded to WIN 8.1, then start But I do not want WIN 8 as an operating system, so the notebook goes back. Battery life not outstanding (new + Optics + Display