As long as the ride goes in both directions, then it's fair, as far as barf distribution goes. However, the side that goes backward first is at a clear advantage. I think the Clone has the right idea--Nice concept!
Hahaha! Really nice, it reminds me of a fairground ride i went on once called 'The Devil's Chariot', which was basically this enclosed in a cage! One woman kept slipping out of her seat every time they reversed directions and kicking the guy opposite her. I laughed, they didn't.