Why are so many people unhappy?
The card will not provide the data given when one of the following things arrives:
- Your card reader is not over USB 3.0 connected (USB 2.0 and FireWire 400/800 are bringing max 20-30 MB / s)
- Your internal memory is a hard drive (unless it is very, very fast)
- Your card reader is Tchibo, Hama, etc. (or worse)
Incidentally, the cameras are least able to support the writing speed.
I can not say anything about the long-term performance, should I be unhappy here, there is a supplement if necessary.