Finally a headlamp with a red LED option--thats bright. If you ever have to night hike in thick fog/mist you will see a major improvement with this red option--you can actually see your feet! My previous Remix has worked great and this newer model has about 30 more lumens (100 vs. 70).
No long term data yet but so far this is my favorite headlamp. The PT Byte was nice and light but has a very dim red LED vs. this one.
PS REI should allow these reviews to be edited by the writer--this allows for long term use updates,etc.

I'm a backpacker. My last Princeton Tech mini headlamp broke and doesn't seem to be made anymore, too bad because I really liked it.
This lamp has a fatal flaw: the large obvious button turns the lamp on by simply pressing it. That means that it cannot be packed in one's backpack without removing the batteries, because it'll turn itself on every time, and then when you need it, it won't work.
So instead you have to pack the batteries separately and then try to find them and install them in the correct polarity in less than favorable light conditions, which is why you need the thing in the first place, and of course if you do it wrong you destroy the lamp, no warranty and maybe big danger to you, though of course I always carry two headlamps.
My last Princeton Tech had a closed position that completely covered the switch, no problem. My other headlamp turns off by unscrewing the lamp fixture, no problem. This one is a problem. I'm tempted to return it. I just can't believe they designed it like this.
I guess that's the problem with shopping online.

I use this product at work and for outdoor activities (fishing, camping, etc). I love that it is light and comfortable on my head. Being able to adjust from LED's to a spotlight is great too. The spotlight is very bright and the beam reaches far. The LED's do a great job of the batter lasting long but providing enough light to hike and work in pitch darkness. I've had this light for over 2 years and have only changed the batteries once. I highly recommend it! The price is very reasonable for such a quality light. I've purchased three more of these for gifts for my family members.