What is the best scanner?

The "scanner" is a holographic recorder/projector on which the main character views clips of his own life (as part of his job). It is also a reference to a Biblical verse in 1 Corinthians 13 that includes "we see as through a glass darkly", and thus refers to the main character's weak grasp on reality. Ingmar Bergman's 1961 film, Through a Glass Darkly, lifts its title from the same passage. Furthermore, the initials of Scanner Darkly are also the initials of Substance D, which the characters refer to as Slow Death.