I bought this as a backup for my upcoming week long trip that I don't want to bring along the laptop.Also partly to satisfy my curiosity as to how much I can get away with for the cheap price of this one. I bet my luck partly on the Kingston pro reputation. Well, I was quite a bit disappointed.
Just tested it on 40D high speed continuous shooting in RAW, also tested are 4GB SanDisk Extreme III, 4GB Ultra II/15ms, 4GB Ultra II regular, 8GB Transcend x133. Of course, Extreme III is the fastest. but this Kingston is the slowest, to my surprise. Because the Transcend x133 did better than the Ultra II regular, so I was expecting the same for this Kingston. Not so. Also, when I tried "Erase All" on all these cards, Kingston also comes last, by quite a bit. To be fair, Extreme III isn't that great with burst RAW shooting either - once the initial burst is completed (camera buffer filled), the recovery speed is only acceptable - a little wait, then I can do 4-5 continuous shots, then a small wait again. But the other cards basically all take forever to complete the writing - the difference is between longer forever vs slightly shorter ones. That makes wonder how people use 1Ds. 40D only got 10MB after all. Then again, people lived with 34/36 frame films for a long time before the digitals. So what do I know :)
I sorta expected to be on par with the Transcend x133, but turns out, Transcend is quite a bit faster in both read and write. Hey, I still got a 16GB for the price of 8GB, didn't I? :)
Bottom line, this card is definitely slow. But perfectly usable if you are not in a hurry. And from what I've heard, Kingston got a pretty good reputation. But if I were to do this again, I probably would have opted for the Extreme III 8GB than this one, they are about the same price right now.
P.S. Now I found a great use for this card - on my 5D! 5D's super slow processor is a great match to this card. I tested 5D with this and Sandisk Extreme III, no difference. Once the camera buffer is full, nothing in the world is gonna help. So now this card sits in my 5D and does a great service for me. Not wasted after all. The only thing is, don't try to fill the buffer on 5D, you'll regret if you do :). For those who got 5D MkII, this card's usefulness is perhaps open to question...