I shoot with a D2Hs and transfer images to my computer via a built in slot (reader) on my Sony Vaio computer. I currently have a 2GB Extreme III and am very happy. With the recent price reductions in CF, I am thinking of getting another card. Would I notice any difference if I get the IV? Becasue of the camera buffer, I can't image any difference there. However, I'm wondering if there would be a noticable improvement when transfering images to the computer?? Also, would the speed difference be realized since I'm using the built in card reader on the computer? Do I need the stand alone card reader that Sandisk sells to realize any speed difference?