I've owned about 50 headlamps in my life and this is by far the best of the bunch for climbing, skiing, biking or anything that involves both high and low beams. The high beam on the Spot is bright enough that it is tough to "outrun" it while biking or skiing, which is an important feature. The low beam side LED's are great for reading maps, cooking, etc..
I gave this a 4 out of 5 stars as the on/off switch can be hard to find with cold fingers or with gloves on as it blends in so well with the plastic housing. It is also hard to tell if you are in full flame mode (eats the batteries) or low LED mode, so I'm often asking my partners "Is there one center light on, or two side lights?" while I shine the light in their eyes and fry their retinas.