Has anybody ever installed "Superwhite" headlight bulbs on a [DSM]? Are they any good?

Lots of people have. While they obviously work, opinions on their utility are still a matter of some debate. A few owners claim they are vastly superior, while a few claim they are vastly inferior. Most people fall into a moderate camp, claiming little or no difference (good or bad).

For some more information on blue bulbs, Superwhite bulbs and HID lighting systems, please consult the bulbs page of Daniel Stern