I have also been testing this light since I received it several days ago. It has been with me in my pool and used in the lake. Actually took it water skiing attached to my suit. The light has worked flawlessly with no problems. I do have to occasionally blow the lint from my pocket from the LED area.
I did some drop tests from about two feet onto a concrete floor. The first drop nothing happened. The second drop the light went out. What had happened is that the positive terminal on the battery got dented. Tightening the head was all that was necessary to get the light working again. There is enough threaded area on the head to accomodate a wide variation in battery length. If the battery is marked AAA it should work in the light.
The beam does have a blue tint, about what would be expected from the type of LED used. You have some noticeable yellow tinted rings in the beam. Compared to an HDS GT60 the light is quite blue. It also does not have the sharp cutoff on the central beam that the HDS exhibits.
The beam shape is very good. Nice spread. There is not much throw so the light should really only be used for close in work. You are not going to illuminate the top of a 747 tail. Leave that to the larger lights.
This AAA fits in the pocket easily and in fact is really not even noticeable like when carrying the HDS light.
Run time is about what is stated until the light drops to a much lower level. I have not run the lower level to complete battery depletion.
The knurling feels smooth yet is aggresive enough that I was able to operate the light with oily (engine oil, 30 weight) hands without difficulty.
This light, in my opinion, is not going to be one of those lights that will replace other flashlights. It will be a pocket light that can be used in small spaces in close proximity when you need light. It is small enough that you can easily carry it all the time. Having such a light with at all times may just make the difference between being inconvenienced and a really difficult situation.
I am so impressed with the light that, even though I have a beta unit, I will be purchasing 10 of the lights to give as gifts to the families of my exchange students from Germany.
This light is really a winner in the category. Quality, durability, simplicity, diminuitive size, readily available batteries, easily changed batteries. An outstanding combination.