ALLEN MURABAYASHI, PHOTOSHELTER BLOG:
"Our own experience using slower cards in modern, expensive cameras emphasized the point that the camera is only as good as the slowest component, and often, that component was the memory card. After spending $1000 – $7000 on a camera body, we’re too often tempted to skimp on our emoveable media without even realizing that we’re compromising the performance of these highly tuned machines.
"Having a fast card isn’t a theoretical exercise, nor something that is only relevant to shutter blasting sports photographers. Photographing a sequence of images like a birthday cake being carried to a table and having candles blown out can easily tax a poor performing card in a camera with a small buffer."
Read more, here.