I principle LEDs are a good idea but I agree with another poster that when used as rear brake and tail lamps the "pulsing" to my eye as well is very distracting and actually seems to make me tired if I have to look at them too long.
Also even though there are "pure white" LEDs available now, I still see a slight bluish tint from them even in high quality products from TVs to flash lights and LED headlights.
LEDs that a pure white are not REALLY pure white.