Grete Eliassenwrote a review of GoPro Protective Lens + Covers (HERO3/HERO3+ Only) on September 22, 2014
Familiarity: I've put it through the wringer
For the longest time I had no idea what this little black cover was for, but when I realized it was the lens cover I never stopped using it. I love carrying a GoPro around with no casing, but a lens cover. It makes it easy to throw in your pocket or backpack and not have to worry about scratching the lens and then pulling it out when you want to take a shot. The camera becomes super small when you do this too.