I've had failures with both so from my perspective it's all overvalued c* p. I've returned two 1GB Extreme III SD cards, one 1GB Extreme III CF card, and a 6GB Hitachi microdrive due to failure. I got new cards without a problem, but it does tell you something about quality control and reliability. The camera is Canon 1DsM2, and no, these failures haven't been caused by it. These are simply (a word not appreciatted at this forum) products. Don't get me wrong, when they work they work fine, and the new cards have been working just fine for some time now. Just the trouble of having to go to the store several times to exchange them kind of annoyed me. For that kind of money, they shouldn't have such a high failure rate. But then again, all the new hardware does. For every two new computer components sold, there is a person standing in line with a faulty one. Wether it's hard disks or monitors or whatever. I've done a lot of time in lines returning stuff and even more time explaining what is wrong with it and am quite fed up with it
cheers
Dabar