To my ears, and especially for a home video environment, the audio is fine.
The original six track was designed to fill an area 50-70 feet wide, placing dialogue properly behind the actors on screen.
This is a bit different from most home theatres, the majority of those that I've seen being less than 40 feet in width.
Warner has done everything properly here. I especially like the clean-up done to the matte lines.
I've also noted that the entire image is presented, as can be seen from the slight reflective lines at the top and bottom of the frame, a natural part of any large format image, as light hit the edges of the camera aperture.
As a reference, see the frames at the Wide Screen Museum:
http://widescreenmuseum.com/widescreen/loa/loa3a.htm
I couldn't be happier with this release.
RAH