Great Headlamp and Great Customer Service This headlamp is great. The lamp is brighter than my Surefire light for my pistol and takes the more common AA batteries. (This headlamp is so bright you need to turn it down so you don't get accused of shining deer.) Operation is super ergonomic where the metal ring controls brightness and the rubber ring controls focus. The lamp worked great in sub freezing temperatures without a hitch. I wish I had one years ago since you hardly know you are wearing it and you can function like it is the middle of the day. The only thing that could be improved is if the headlamp had more tactical coloring, i.e. all black, and had the capability of operating with different colored lens, i.e. red, blue, etc., for preserving night vision. Note: you need to disconnect the batteries after usage since there is a small current leakage leading to dead batteries. The HL27 model does not have the current leakage issue but is no where near as bright. Postscript: I use this headlamp all the time now doing chores like taking out the trash, cleaning the litter box, etc. I now have two Coast headlamps and one got damaged from constant usage. Customer service got back to me quickly and sent out a replacement under the lifetime warranty free of charge. All I had to do was send a photo of the headlamp with my phone and I got a new headlamp. I will definitely buy Coast products again. I used to purchase MagLite products , but will never do so again since getting Maglite to honor a warranty was like pulling teeth since you have to mail everything back snail mail and the response time was glacial.