I used this headlamp for Rainier in July. It was sooo bright. I brough backup batteries just in case, but the battery lasted plenty long. There are many different power settings, and the buttons are easy to access. I'm stoked that it's supposed to be so water resistant too, since sometimes I need it out in the rain for long hours. It's pretty light, powerful, and sweet! All for a great price. The batteries for it are super expensive though and a little awkward to get in the casing.