This light is 1) blindingly bright (when it needs to be), 2) small, I mean really small!, 3) shockingly light and 4) built like a US-made tank. What else is there to want?
I have lots of other LED lights including SF and two other 47s. I have high standards and high hopes for this light, and I was not just pleased with it, but impressed.
If you are looking for a light in this form factor, look no further. I love its interface, and unless you need an EDC that will instantly blind an aggressor, the interface of this light is perfect.
This is a practical light for almost all nonviolent uses. This light won't bash anyone's skull like the SF E2D, or win a game of chicken with a car like the 4x123 lights, or provide an infinite range of brightnesses like the $200+ SF T1A, but it will work reliably cycling from low to medium to high brightnesses with a smooth back-and-forth 1/8th turn of the bezel answering almost any need for light.
I will mention that since the switch is by screwing down the bezel, it is possible not to turn it off enough that a slight pressure on the bezel will activate the light. If you play with the amount of pressure necessary to switch on the light, you will see it is easy to avoid. However, should you inadvertently activate the light in your pocket, you have about four days (100 hours) to notice before your battery is dead since the first setting is the lowest lumen setting.