Property me now already a second card gained since it absolutely met my expectations. The recording of 4K video in a Panasonic GH4. In a USB 3.0 card reader it is running on well 90MB / s when reading and copy to the hard drive. What more do you want. Long-term experience, I can logically no but deliver far perfect as it should be.
Small speed test:
With a USB 3.0 card reader is with me when Windows 8.1 Write on the card up to 62 MB / s and read at up to 87 MB / s So about the promised values.