One problem related to front seat head restraint has been reported for the 2012 Nissan Leaf. The most recently reported issues are listed below.
New car headrests are angled too far forward. I do not want to slouch, so I would like to sit with my seat upright. This forces my head into a very unnatural position, causing me pain. Even with the seat tilted back, the headrest still forces my head forward, and creates a difficult driving position with my shoulders slumped forward and my head tilted. This causes headaches & distraction. This discomfort is also true of the 2013 Ford focus, the 2010 Toyota prius, and the 2013 Subaru outback that I have recently driven. I understand this is an effort to reduce whiplash injuries, but it is causing flexion/overuse injuries in owner's necks!.