When I was in Germany this past summer at EuropaPark , they were field testing their VR glasses on one of their coasters. Management and employees only. (funny seeing guys in suits and ties on a coaster) They were handed the glasses as they waited for the ride, put them on in the car, and they were off. They all seemed to really like they experience. No green faces at end of ride. Went on for half a day. Glasses were green but not that large.