I think the headlight modulator (especially if it deactivates at night) is an overall benefit. The argument against it is that people will panic, thinking you are an emergency vehicle, and end up crashing themselves or you. Does that happen to genuine emergency vehicles very often? I don't know.
Flashing tail lights are a great addition too.
I have also heard people say that a triangle of lights dramatically improves visibility. Even more so if the two lowers are amber. I also really like the reflective stripes on motorcycle gear that manufacturers are using these days. They cannot be missed at night (except by the most inattentive drivers).