My wife and I used this card mainly for video capture and an occasional wide angle pic or two with a Canon SD 800 IS while on a Great White Shark Dive and Safari in Southern Africa. The card performed flawlessly while in somewhat harsh environments. We took video while in an underwater housing for the great white shark dive in 12 deg C H2O (over an hour in the water) as well as other video in the Victoria Falls, Chobe and Okavanago Delta areas. It worked through rainy and humid conditions giving way to searing sunlight with ultra humidity. Worked everytime and I would recommend this card to anyone looking for increased size, speed and reliability.