Pros: - very bright for the price and the size - easy to carry - nice aluminium build quality - comes with a nice amount of accessories; the clip makes it easy to remove from your keys when needed - battery life seems to be very reasonable (have yet to change the battery yet after 3 months)
Cons: - The black coating is easily scratched off by your keys (just adds to the weathered look haha)
Things to note: - it is a twist top as many key chain lights are, some may prefer a button on the side or at the tail end
Final thoughts: Easy light to carry around and hence is always with you when you need it most. Has much more throw than your phone flashlight. Using an AAA battery, replacement batteries are easy to come by and are cheap. Whilst there may be brighter and smaller lights out there (usually rechargeable), they are often far more expensive.
I think this light is fantastic value for money. As such, I've bought a couple as gifts.