The measured values are with me (fixed built-up card reader in the HP notebook) is not as fast as with other testers, for Class 10 That's enough. Continuous shooting mode in a Nikon D3000 slow at JPG fine from 20 image.
Bin because of my Alpha 200 with CF card (also 16 GB) other usual (running full speed until the card is full). However, was this Sandisk CF 30MB / s twice as expensive (more than one year).
I am curious to see whether the card and long stays alive.
For use in the backup camera I can not complain. With sophisticated equipment with the right speed continuous shutter (so from A700, EOS 40 / 50D, etc.) I would resort to a faster card, where the range of variation of the measured access speeds is not as generous as here.
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Edit 04/2013: card continues behaved in different devices, not super fast but with no data loss. Appreciation on 4 stars because of the reliability.