As a conservation biologist working on frogs, salamanders, geckos, snakes and other small critters with nocturnal habits, and a dedicated amateur photographer, headlamps for night work are essential for me. This one is my current favourite, has been for a few years now. It can just about illuminate a small animal while I'm focusing a bulky SLR camera with large top-mounted flash - always a tricky situation getting a light to shine past that big flash at your forehead. It's rainshower-proof. It's about as comfortable as a headlamp could be. The hi-power light output is good for field work, to see things in good detail at your feet or a few yards up ahead, without washing it out in excessively bright light. It's not powerful enough for spotlighting owls or mammals in the distance - get a large heavy halogen for that. The low-power LEDs setting is fine for making notes or general navigating on the trails. The best feature is the battery usage: three penlites will last me for over a full week in the field. Perfect for expeditions - leave home loaded with a fresh set of batteries and a set of spares (just in case), and that's it. A massive advance over earlier halogens burning through four penlites in a single evening, or three C-cells lasting 2-3 nights. That's a lot less weight to check in and carry around, and a lot fewer batteries to buy and recycle (where that's possible). In conclusion: one of the first pieces of equipment that I pack for any field trip. And while I hear great things about Princeton Tec's customer service, I can't confirm this from experience because I've not had failures with their products in nine years of using a variety of models.