User Review: Princeton Tec Quad
I have been very happy with this headlamp. It is bright enough for night hiking and the angle can be adjusted depending on what you need to see (or to keep from blinding your hiking partner when you turn toward them).
The low-battery warning is a nice feature. I also like that this light is water resistant; this is important for a hiking headlamp because sometimes one ends up hiking in rain and it may happen to be dark out as well.
My only complaint is that it is kind of hard to open the battery compartment. Maybe this part of the design is necessary for water resistance, but it does make battery changes a bit of a pain. The good news is that this light doesn't go through batteries very quickly.