It's very bright, has many useful features, and costs less than most head-mounted lights for sale. It really offers the best bang for the buck. If you need to more quickly turn your light off, try getting the DELTA PEAK series from the same manufacturer. The beam may be too narrow for some, but for my activities (night biking and hiking), it will do just fine.
Tip - You could mount this on a bicycle helmet by using some velcro straps. However it does not look so good, quite big.