I think these in-ear headsets are very good for passengers, especially female ones, because they don't mess-up one's hair, and if the thing falls out (partially or wholly) because the cable got sat on, etc, then it doesn't matter because the wearer can just push it back it.
However I found it hard to use because unless one took great care of the cable, the thing did occassionally partially come out, and this could happen right when one is busy with ATC etc.