I have a copy of this video and indeed it is worth seeing; the scenery in Milford Sound is great.
The Soaring Society of America sells copies for US$38: see
www.ssa.org/catalog/ (mine is a 'bootleg' copy that my wife picked up for much less).
"Running on Empty" is another video available from the SSA, and is also worth watching. It's about the Hitachi "Masters of Soaring" international competition at Estrella Sailport in Arizona.