First impressions are of simple packaging and design, as with other Knog lights, the size is determined by the batteries (2xAAA) with the unit contained within a one piece silicone moulding. Knog's fitting system using a simple silicone strap is used on the Gekko which enables the lights to be quickly fitted to your bike and be fitted in a number of places. The trio of LEDs are bright and highly visible and the white silicone casing of my model appeared to glow! I stopped on a quiet, unlit road to assess the light's output with my other lights switched off. The light spread is impressive, I had a pool of vision roughly 1 metre either side of me, and a good 5 metres in front, it was fine for a leisurely ride along a quiet lane, when I reached a lit stretch, there seemed to be little light from the Knog adding to the street lighting. I like to have the road ahead lit up in the dark as the street lighting often doesn't highlight potholes and sunken drains, and I'd be reluctant to set out after dark with just the Gekko on my bike. The rear version produces a good output that is clearly visible from a good distance, with a range of flashing options to grab the attention of traffic. Again, I'd be reluctant to rely solely on the Gekko, although that's more down to my preference for multiple lights to maximise visibility than the Gekko's ability. The Gekko is a great value compact light to have in your bag for those days where the light goes early or you end up running late. It will make you visible and gives off enough light for a leisurely ride along an unlit path.