Well, just like any tool, there's a proper time and a place for use, and definitely a proper time and place for non-use.
They should be installed on your high beams so you have the option of turning them on and off.

Uses:
- riding in formation - NO
- riding in slow/stopped traffic - NO
- riding in consistent traffic, i.e. behind the same car for any period of time - NO

When the above criteria are NOT in effect AND:
- riding on open country roads - YES
- riding in neighborhoods - YES
- riding in populated areas - YES
- riding on highways and super slabs - YES

You simply are more visible, but that doesn't take away your obligation to ride like you are invisible.
Ride safe & responsibly,
Steve