Summary: I purchased this product because I felt the need for more storage in order to shoot RAW files. I have used it to photograph a live concert, and was very pleased with the rapid read-write times even in the demanding RAW+JPEG format. The speed performance compares quite well with my existing 2GB cards. I've had it less than a month, and haven't seen any downsides so far. I think it is more than adequate for the kinds of photography that I do.
Summary: I am using only Sandisk Extreme III or IV since I began to work with digital and I never had a problem with them. When my cards are older than 3 years I stop using them as prime cards keeping them as a back up. I prefer not to exceed 4 MB in order not to risk loosing too many shots in case of a card failure (that indeed I never experienced). Now with my Nikon D3 equipped with dual memory slots the flexibility is dramatically increased.
Summary: I bought this card for my D100 (with version 2.0 firmware). The card is fast but unfortunately, even after formatting the card under Windows as FAT32 with a 32K cluster size, the camera would say that I can only have 390 Raw images on it. Under Windows or Linux, I can see all 8GB of the card. Even so, it is fast and will work well in my next DSLR. It was nice not to have any software preinstalled on the card!