Bought the Kodak 256 SD for my Dimage Z2 and have had no problems with it at all. It seems to write data very quickly - I've never yet had to wait at all between snapping a shot and viewing it instantly. Shooting at 4mp's, fine quality, I've managed to store 176-180 photos every time I fill it. It'll download the lot direct from camera to iMac in 5-6 minutes - whether that is fast or not, I have no comparison, but it's certainly not annoyingly slow. Good enough that I'm about to order a couple more.