I didn't see this in an IMAX theater, but on a 3d HDTV. In searching for material that demonstrates the technology, a shopper can be challenged unless you want four of the "Shrek" movies or horror films that are good for perhaps one viewing.
But this film is educational, beautiful and a spectacular subject for a 3D film. The soundtrack by Dave Matthews keeps any of it from being tiresome. The river rafting sequences are well-placed and the aerial shots inspiring.
The participants, Robert Redford and Robert Kennedy, Jr., add gravitas without being too heavy with the purpose of the film: Conservation of fresh water and the world-wide crisis.
This is a stunning film visually, and the camera spends a great deal of time "in love" with its subject: the American Southwest.