Seriously fast, keeps up with my 9fps Nikon D3.
Hasn't failed yet.
I also have a SanDisk mounted in the 2nd CF slot in case something happens.
But 1 year solid, MADE IN THE USA, and going strong. . .no complaints here. . .not sure how it'd do with video, but as far as taking pictures and holding thousands of pictures, don't go farther than this.
Remember, no CF is 100% reliable. Backup and FORMAT YOUR CARD every time you clear all your precious pictures off of it - and you have to format it IN YOUR CAMERA, a lot of people forget this!
Happy shooting. . .
Updated, with the price dropping even more on these, I purchased another.
So far, I've been shooting for quite awhile with one 32GB 600x Transcend. I purchased another to fill both slots of my D3 - I'm also hoping, with the impending release of the D4, that I can take advantage of the fast writing, transferring, and capture speeds of the Card as picture sizes invariably grow. Very happy with these cards...just remember to format in your camera before you start shooting!