I can only play the comparison between an XD (in my Fuji) and the SD card. The difference is huge! Well, both playing cards in terms of speed in the other leagues. When Transcend there is as good as almost no time delay when writing. In particular, it noted that in larger video files that you receive with a digicam.
For data security: So far I can not name a negative point.
I would buy the card at any time. Good, cheap, fast!