Bob Smiley makes a good point.  One of the things I was most impressed about
was how quiet the ES was when I flew it at the factory. And I figure on going
cross country so I don't want the fatigue of loud noise in the plane.

The folks that talk about having a good ANR headset also have a good point
but you have to realize that noise comes in an infinite number of frequencies
in the range of human hearing.  The chips that process the information from
the ear-piece microphones aren't capable of controling but a relatively few
number of frequencies.  If it did, you wouldn't hear anything.

Dan Newland