Is it fast enough? (I know... "Define fast enough!") It is Class 6 but I can't find measured speeds. I think it would be great to have such a card to easily share pictures but am not sure what the tradeoff is with, say, everybody's favorite Sandisk Extreme card. Edit: I also see that on a Toshiba compatibility list I could find the X-Pro 1 and X10 are listed but no X100. It might be because they weren't tested or maybe there is an issue?