Whether you need to worry about being hit from the front depends on your cycling environment. For city riders, it's a big issue; left crosses and driveway/intersection pullouts are a major issue and you can't always defend against them. I need the light more to see, since my route is almost entirely rural, there simply isn't any approaching traffic that's going to do anything except drive right on by, and there are only about 2 intersections on my whole ride. Others are probably between the two extremes. So it totally depends on your situation.