Knog popularized the whole rubber coating on all of their products and I'm not a fan. When that rubber gets corroded by the sun, the light is basically worthless. There are better alternatives that don't suffer from this Achille's heel.
Great, simple design. Very secure so long as the tube is large enough to create resistance when stretching. Three different light patterns (solid, continuous strobe and 3 blink strobe). Light weight and low profile...stays out of the way and easy to take on and off. Easy to turn on/off. Very simple design + great execution = quality product.