I stand corrected! Actually I left half of my argument out -- I use slow speed cards because I've never run into a buffer blockage while shooting, and they are cheaper. So it means sitting around a while longer to download, but that is about all. I am a hobbiest, so time isn't that important. As long as I don't miss a shot because the buffer is full. With high-speed cards, a firewire reader would be to advantage.