I have seen Richard Grays make a dramatic difference in the video quality of a top flight DLP front projector system - heightening detail and contrast (deepening black levels). Unfortunately, the set-up I saw used multiple units - 4 all told - which is a major, major tweak. How well 1 or 2 would work on a regular CRT TV, I am not sure. Actually, I'm pretty sure it would improve the performance but whether it would improve performance enough to justify the cost is not clear. Improvements wrought by the Richard Grays were much easier to see on the big screen, especially since DLPs are fundamentally weaker than CRTs in black level.