Burton; do you find the Reevu is a distraction when cornering? Especially when making progress above the limit. I'd worry about motion sickness or something if i could always see behind me.
I don't typically use it while cornering. I use it as a real rear view mirror reducing head checks. I also use it to check exit / on ramps before merging. And I use it passively, that is not directly looking at it, to keep track of targets behind me.
This review is rather old but I do cover more in here.
I love this helmet too much to get another one. Having the extra information is just too valuable at this point. I do know several in AU who use this helmet while racing to better see where their opponents are behind them so they can better judge braking into corners.
As far as motion sickness I don't think you would have any. More than 30 minutes on a train, bus, or 1 hour in a car, or 3 hours in an airplane with someone else driving and I cannot be on that vehicle any longer. I never get motion sickness riding a bike or flying a helicopter though. I have never found the helmet to give me any sensation close to motion sickness and I have gone on 500+ mile day trips into the mountains and back just fine.