Have the DOS variant chosen me and then Win 7 Pro 64 draufgespielt after I had bought from the Lenovo homepage me all the necessary drivers. That worked without any problems.
The only drawback, in my opinion, are the USB port location (front left), with connected 3.0 peripherals. Here is down while typing and again put pressure on the / the plug. What for the mechanical "longevity" of an influence has I can not say. If you connect any peripheral, but does not have to worry about.
As overall conclusion I can say that the Lenovo G505s is highly recommended.