any one ever used these guys

Argh! It's SANDISK.
Sorry, but when you work in retail and people call things the wrong names (scan disk, ny-kon, lowe-prow)

But Sandisk, I would say there is a big difference. They offer a lifetime guarantee - if it fails, they'll send you a new one.
 
Transcend is a good make of disk, they are much better known in the states than here. Class 6 is about as fast as you'll get but make sure that whatever you want to use it in will accept 16gb cards.
 
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