I use a Nikon D700 camera for hunting and often photographer birds in flight. Therefore, by using the RAW format for high-speed storage of files that an average of about 25 Mb each weigh how for this type of photography is very often I have to shoot in bursts of 4-5 frames per second. With the above in 400x, I was forced to suspend the shots were not finquando all your photos. Now, with the Bay-Computer Professional 600x 64GB to have solved the problem and I can the length of the bursts at will. Logistic service was excellent, I ordered the product on November 2nd and November 9th had in my house in Sicily (Italy) came from the United Kingdom ... fabulous ..... thanks Amazon