[thaumasiotes]

I felt somewhat sick watching a let's play of the half-life 2 bridge level. No difficulty with VR there; that problem is simply the accurate depiction of incredibly unsafe movement through an incredibly unsafe environment.

It makes for an interesting conflict with the desire to provide an "extreme" experience, I think.

[LCDninja]

Well put! - in my line of work it's a conflict between producing something impresses the majority, while at the same time prevents the minority from vomiting on the gear (touch-wood, hasn't happened yet).

[goldenkey]

Sickness and vertigo isn't always met with vomit. I encourage you to seek out another metric that respects the delicacy of the headspace of even those with iron stomachs. (I personally get headaches but no nausea effects..)