Good and compact
This light is legal for UK road use, which puts it above most other lights sold in the shops.
It is a good, bright light. You can use it in total darkness, but it's not bright enough to travel at high speed in total dark. It is perfect otherwise.
I have dropped it numerous times onto concrete from waist height, and it has not suffered at all.
The battery life is pretty good, considering the brightness, and it has a warning indicator for when the batteries are running low.
It is easy to remove from the bike, and easy to use. I would purchase this again.