Size/Weight:
Even though the P0 is made of stainless steel instead of the typical aluminum lights, it is still very light weight due to its small size. I don’t think you will find a AAA battery light much smaller than this. The light could feel right at home on a keychain or even on a necklace as a neck light.

Grip/Handling:
The Po is quite a small light so gripping or operating it with gloves on can be a bit tricky. With bare hands, the bead blasted finish provides enough grip to turn the head and operate the light with one hand. I also found since it was so light weight, that it was very easy to hold in my mouth so I could have both hands free.

Build Quality:
The build quality seems on par or above other AAA lights on the market. You don’t get the full sense of quality like you do with the larger lights, due to the lack of any fancy machining like knurling, grooves, clip attachments, etc. The light also uses a foam ring placed in the head of the light to prevent the battery from rattling when the light is off, with the head loosened. So sometimes you don’t get that precision feel you get with lights that use a spring. But the machining of the light is very good, the threads are nice and tight with no play.

Features:
The Preon P0 is designed very simply, so there isn’t much when it comes to features. You have a very simple 2 output level light. Tighten the head to turn it on, loosen it to turn it off. To change levels, turn the light off then back on again in less than a second. The light will default back on in low mode if not used for a few seconds.
But there is one surprise feature! There is a magnet in the tail of the light! This may not always be a useful feature since you have to be around a metal object. But when you are, it is quite handy and I think it would be great if more lights did this. For example, the headboard of my bed is metal tubing, it worked perfectly. Stuck the light on there, could even angle it the way I needed to, and laid in bed reading a book. The pure flood of light is perfect for close up things like that. It also works great if you have drop ceiling panels like in an office, you can stick it to the metal rails.
The optic of the light also has a glow in the dark coating which glows fairly bright. Only glows for alittle while like most glow in the dark stuff, but its nice to be able to lay it down and see it when you goto pick it back up. Its actually bright enough to read a map by for a few seconds right after you turn it off.

Output:
    The pure even flood of light the Preon P0 makes is what sets it apart from other lights. I think this is perfect for a light like this and of this size. If I need more output or a tight spot for further distances, I will grab a larger light. The little P0 is a perfect light for close up work because you don’t have the typical hotspot to distract you or ruin your night vision.
The low output level is good for night adapted eyes. Since the light just has the 2 levels, I think it is a good comprise between being too low for alot of uses, and being so bright it ruins your night vision. On high the tiny light puts out quite a wall of light, pretty impressive given its size.

Pros:
Very small and light weight
Simple 2 mode operation
Built in magnet in tail
Pure smooth flood of light with no artifacts

Cons:
May be too small to operate with gloves
Not useful for long distance lighting

Conclusion:
At first, not knowing anything about the P0, I wasn’t all that excited. Eh, just another AAA light, there are plenty out there. But after realizing it had a pure smooth flood beam with no artifacts, it really changed my view of it. I think its the perfect output for a tiny light like this. For use on your keychain or around your neck, its typically going to be used for close work, so the flood is very easy on the eyes. I think it fills a nitch category that not many other lights fall into.