But you should the practical performance into perspective.
It discusses the maximum speed mainly in other Rezensionsn. But this refers to the most favorable case of sequential access large files like videos. The class refers to this herself.
In practice, however, want to put a mix of small (documents, books), middle (photos) and large files more often on a pad. The speed plays with the accessed smaller blocks is a much greater role than the maximum speed. In the usually massive lower test results in 4K blocks but is rarely mentioned.
Interestingly, I have also found that this card is much slower when it is well stocked.
The Transcend leaves a streaky impression in my scenario.
Little filled with it reaches roughly 18 MB / s read and 15MB / s write in my pad expectations completely. But more than 50% full it is considerably slower. Good stuffed (with 5-10 MB files) performance is reduced to roughly 8 MByte / s read and write 5 MByte / s - still respectable, but still far from Class10 or the maximum values or the magical 20 MByte / s limit for USB connection.
One may not put to weigh the numbers, depending on the device and data mix are likely to be different values, but the trend is obvious.
My Conclusion:
A good map but in practice no performance miracle.