Ive been hard on mine - Streamlight ProTac 1L-1AA Ultra-Compact Flashlight

This light is part of my EDC. I use the $h!# out of this light. It gets used at work constantly also for weld inspection. I've cycled the on-off button thousands of times by now, dropped it on steel and concrete, it lives in my pocket during welding and grinding, it's the most used part of my EDC. The size is just right in my opinion. I use AA batteries in it for the most part and find the brightness and battery life to be adequate. Can't be happier with this light.