My girlfriend and I have used two Tiara for hiking & camping since this summer (one Tiara for each of us), so here's my feedback based on our personal use.
The cons:
Modes: I think a 6-8 hour mode would be useful for activities such as hiking, caving, etc. I find that "Main 1" is too low to hike with best visual confort and "Main 2" lasts too short (3 hours) so a spare battery is absolutely needed.
However I don't have any solution apart from programming features, an intermediate mode would be too much and the existing modes are very useful in other situations.
Bettery indication (blinking button): I think one or two blink would be sufficient in the firefly modes. I also find the blinking led too bright in all modes: I would see it as bright as currently for the first two blinks, then blinking in a lower level so that it doesn't bother people around.
Warning indication: I found that the critical level (with red blinking button) came very fast after the first warning (orange button), when using an Ni-MH AA. The critical level outpoot is also too low to be useful, I wouln't want to be lost in the woods with such a low beam.
Weight: this lamp is somewhat heavy compared to competitors, making it not suitable for Ultralight Hiking enthousiasts. From my personal experience the weight remains perfectly acceptable and I forget the headlamp when I have it on my head.
The pros:
Beam: I love it, I have no complain at all, for the this is the perfect beam for outdoor activities (smooth and large beam), especially with the high-CRI 2700K tint.
Mode switching (double-click, long click, etc.): it becomes intuitive and easy to use once you catch it when reading the manual.
Customer service: my experience has always been positive. Armytek made great efforts to send our lamps before we go camping and didn't charge the additional costs, so once again I have to thank them for that. They did the same effort many years ago with a defective Predator so that I could go caving with a new one.
Removable magnet: this is a neat feature I use (wether to hold the lamp in my tent or to remove the magnet to save weight on my head).