My friend has this pulsation problem with his Dura Ace front wheels (rim brake). 2 different wheels from 2 bikes. It's so bad on one of them that it feels unsafe. He found out that another friend had the same problem some time ago and Shimano wouldn't warranty it.
He also found this old video where the guy says he eventually got a refund. Anyone ever heard of this and if there is anything that can be done?