I use this card with my Canon Rebel T2i and have not had any issues with it. This card keeps up with my 18mp continuous shooting, and my hd video (1080p at 30fps and 720p at 60fps). I haven't had any read/write errors, and never had to low-level format it or anything. I put it into my camera, and it works.I also have a Kingston 8gb Class 4 card that does just as well as this card, and Kingston is known for being a little more reliable, not to mention it's $5 cheaper here at amazon. So while there's nothing wrong with this card, the Kingston is cheaper and does just as well.