I also upgraded to the new headrests- they do work great and completely fix the issue of the 2011 headrests. It is an expensive upgrade though, particularly for something Ford should have done right in the first place.
I'm selling my old 2011 headrests (in as new condition) on ebay. These would be perfect for someone who wants to try re-upolstering or other modifications to get a more comfortable headrest, but don't want to sacrifice their stock headrests.
Medium light stone leather,
$29.99 + shipping
http://www.ebay.com/itm/330861287633?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649