I have used the Sandisk line of Ultra II Compact Flash & Secure Digital memory cards for over a year now, and have nothing but praise for them.

I have shot well over 24,000 images on the 2 GB CF card, with 0 image failures.  The card has been used in a Canon 20D.

My 1 GB Ultra II SD card has been used for well over 1,500 exposures on my Canon SD400.  0 failures.

The card allows me to shoot over 15 frames of RAW continously on the 20D before the buffer fills up.  On the SD400, the Ultra II allows me to shoot over 1.5fps continously, until the card is full!

Overall great performers and worth the price!