Summary: I didn't want to rate it bad, I'm sure its a good card. I bought 2 of these thinking to use them on the Nikon D4 but it just errors. I saved them for the D800 I also was buying but they error on it as well. Now I cant use them and had to order different cards.
Summary: No matter what I tried I could not get this card to work in a Nikon D800/D800E. It kept displaying an error message. Seems to work fine in a Canon DSLR, although I did not test the video functionality.
Summary: Just in case you're looking at this card to use in an Edirol R-1 recorder, don't bother. The recorder doesn't complain but it won't format the card and if you press record the recorder just pops immediately to stop. I tried two cards with the same result. I thought Compact Flash was supposed to be a standard ? I ended up spending quite a bit for a 4GB Sandisk Ultra which I had to get from Sandisk, no one sells them anymore. That worked fine in the R-1.
Summary: Strange thing happens when shooting video using the Canon 7D. I will occasionally receive an error after recording a segment, resulting in the latest shot not being recorded to the CF card. This issue does not happen when shooting photos.
Summary: Never had a problem with any of the 14 or so that I have. Used in Canon DSLR cameras EOS-40D and a EOS-50D. I used these cards for Air Shows, Auto Races, and Weddings and everything in between.