I've been carrying the E01 for something like... 5 years. I honestly can't remember when I got it. I recently I've considering updating, but I really can't imagine a light being much more durable. I kind of like the fact that the E01 lacks a lens to get scratched or cracked. I can testify to it's durability. Last winter, the top of the light (the part containing the LED) actually unscrewed and fell off during a night of debauchery. About a month and a half or two months went by which consisted of rain and snow. To my surprise, one day I found the bit outside my friend's place, on the sidewalk (of Philadelphia) mixed in with some dirt and various debris. I washed it off, screwed it back on, and it's worked perfectly ever since.