I'm not sure what causes the motion sickness, I guess it has to do with the bobbing of the screen. I don't have it when playing portal, so it isn't the first person perspective. I do however notice that I tend to stare at the screen when playing ME, that might be (part of) the cause.
Oculus Rift? I don't want to barf over my screen, thank you.
@ben_g thanks for the offer, I'll await if there are more people who want to trade. I'll decide at the end of the week.