I have a dinotte (the one that takes rechargeable AA's) and absolutely LOVE it, but I commute in very dark mornings on roads where there isn't much traffic (or on very dark wooded trails). I understand the risk that the light might be excessively bright to drivers, but so far have only had wonderful experiences with it. (It is a helmet mount, and I try to make sure it doesn't cast up/out too far.)

A friend of mine at REI told me that he feels riding with the light has really changed how traffic behaves around him (probably because they're crying, "My eyes!). I have had improved luck with mine as well.

I love it. I got the light because I needed to SEE. I also have front and rear flashing lights in the interest of BEING seen.