I can’t write an actual review here because I purchased mine elsewhere, but for a $30ish dollar light, I would pretty easily give this one five stars. It’s small, simple, reliable and pretty powerful given its diminutive size. The pocket clip works well and the keychain attachment is even better. The UI is dead simple with output levels that are well spaced.
Most of the issues described as “cons” in other reviews, I would tend to characterize as acceptable compromises necessary to maintain the small form factor and high output. Sure, a replaceable battery would be nice, but it would also likely decrease charge capacity, and/or require the light to be bigger. It would also render the light less waterproof, or necessitate more engineering and expense to maintain the current level of waterproofness. Having to hold the button for a couple seconds to activate the light is a little bit of a hassle, but it protects well against accidental activations.
I have many small EDC type lights, but for one that I actually feel comfortable using and abusing, this has moved to the head of the class.