Summary: I have the 233x version and an older 133x version of this card. Both work perfectly. I use these in Nikon D300 and D700 cameras and the cards do not seem to slow multiple exposures. I have never lost a file on either card (I've shot thousands of images on these cards). I will continue to purchase. This card came with a link to a file recovery utility which was pretty neat also.
Summary: I used this card on two rather long shoots. The card worked smoothly and rapidly. I usually don't this large of a card. When shooting RAW the extra space is needed. Good product for the money. It also included the recovery software that can be used on other cards.