$1500-$2000 is rather pricey but if you look at the price of an Aria helmet $750 and a Garmin Zumo $650 then the price isn't so bad and remember the price will drop after the rich BMW riders start to purchase them.
I like the idea but the view with actual Nav or street info on it seems confusing.
I'm not sure how much visual interference there would be having that in front of your field of view?
Seems like you wouldn't want to have that map and red lit direction right in front of you on a busy street?
I'd have to try it to make a better determination.