First thing I'll say, is despite the claims, I was really impressed with how bright these things are. They're powerful, especially for their size.
Because of how small they are, I've taken to carrying mine in my pocket. Mostly, it was for amusement value. These things are a lot of fun to play with. However, you also never know when you'll need a flashlight.
Well, tonight it happened. I was walking into the bathroom, went to turn on the light, and nothing happened. When the light is out in the bathroom, it is pitch black in there, and I wasn't amused (I had to go rather badly;-). Then I remember my flashlight, pulled it out, and life was good.
These things seem a little expensive at first (Almost $20 each), but trust me, they're worth it. The battery life on them is really impressive, they look cool, and they're essentially indestructable. They even come with a lifetime guarantee. If they stop working for any reason other than dead battery, the manufacturer will replace them free of charge.
They also make, I've discovered, great geek gifts. ;-)
If anyone is considering getting one of these, this is a good page to check out, specifically their photographs of each color being displayed.
Now if they'd only come out with a violet one. ;-)
If you're wondering, yes, I think these things are really freakin' cool. ;-)
 I purchased a red and a green Photon II light. I got the red, even though it's less bright than most of the others, becuase of the 120 hour (that's 5 full days) of use battery life, and because it doesn't disturb night vision, making it useful in the car and hiking, when you want to keep good visibility. I got the green because I like green, and it supposedly has a longer battery life than the other 'bright' colors. I'm considering getting a blue and/or turquoise soon, too. ;-)