I'd be happy to use them in single-shot mode. If you are using high speed burst mode, I'd do some extensive testing on trivial pictures of stuff in the garden (for example) before doing "important" shoots. I'd also make sure the card is formatted regularly - in the camera - on a regular basis.
Have you found the manufacturer's claims of speed (80x and 133x) match the real world performance?
As nirofo says, you can't really go wrong at that price.
Duncan
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