I use it for 1 month and a half Kubuntu Linux and Windows 7. For Linux Kubuntu / Ubuntu, my G27 is supported from the 14.10.
On Linux I use it with SuperTuxKart, SpeedDream, Stunt Rally and VDrift. Force feedback is well supported with VDrift (other games do not support force feedback, whatever the steering wheel).
I can adjust the steering wheel rotational amplitude either Linux or Windows (personally I prefer the 360 degrees).
On nickel.