Just got mine today and I must say, although it's a reasonably good headlamp, I do have a few reservations about it.
I tried it with Alkalines and the first two low modes were both reasonably bright but no difference between them.
Tried Energizer lithiums and the levels went medium, medium, high, high.
Tried Eneloops and now I have 4 beautifully spaced levels.
First off the good points. It feels quite solid, headband is comfortable, red LED is a good feature, on Eneloops the levels are evenly spaced, and the beam is quite good.
There are a few points I'm not too happy about though.
First off, the battery cover is a fail. It feels flimsy, does not feel like it is on properly, and is not easy to open at the best of times.
Secondly, I'm not convinced about the longevity of the switches.
Last of all, I am not convinced the tilt mechanism will last. I have seen this mechanism on the LED Lenser H7 headlamp and I had to replace it 3 times before I gave up on it. It just wears out too easily and renders the light useless. I suppose only time will tell, and sure I'll be putting it through boot-camp over the next few weeks.
I don't think my trusty old HP10 will be retired any time soon, and there's always my awesome Spark SD-6 sitting there ready for duty.
I like Fenix lights, have a heap of them (30+ over the years), and I really want to like this light, but sorry Fenix I only score this one a 5/10.