My fiancée and I flew FRA-SFO in 15 J/K last weekend. The only complaints specific to those seats are that the reading light from 16B shines directly in the eyes of the person in 15J. If I have the opportunity again I'd choose seats that don't face anyone else -- 12 J/K or 17 J/K. Still love the UD for the storage boxes and the "quiet feel".

More generally, as relatively short people, we found the lack of a flip-out footrest uncomfortable -- there's nowhere to put your feet when reclining halfway. As others have reported, there were issues with the AV; in particular, the map couldn't figure out whether we'd arrived at our present position traveling east or west from FRA!