Is UDMA's speed advantage apparent only in the camera, or is it faster when uploading images to the computer as well? I see a big difference between SanDisk Ultra II and Extreme III, and then again with the Extreme IV, in the camera, but the real advantage in my totally unscientific view is how much better performance I get in my SanDisk FireWire CF reader. Would UDMA be faster still? Would I need a new reader?