Performance is nearly the manufacturer's instructions

Bought and tested was the model: "SanDisk Ultra microSDHC with Adapter Class 10 UHS-1, Model number: SDSDQUI-032G, which is provided by SanDisk for use in cameras and camcorders.
Similar models, but with a different number shall LT SanDisk specifically for use in Android smartphones determined. (Eg: SDSDQUA-032G - on Amazon was reported frequent failures of this card).
For use in high-quality and modern cameras or camcorders, the map seems only conditionally suitable, since it continuous shooting for example: with a Sony Alpha 77 or the production of films in full HD / 50p behind the writing speed higher-quality micro-SDHC or micro-SDXC cards considerably stands.
The test was carried out 3.0 connection to a PC with an Intel processor i3570K on USB.
As a card reader, the model was used RDF5 USB 3.0 Transcend.
The information printed on the packaging information of SanDisk for speed in the wording: "Transmission speed up to 30 MB / s; write speed lower.".
After a full test with H2testw a write rate of 9.66 Mbyte / s (Class 10 just missed) and a read rate of 39.3 MB / s measured.
In order for the card meets the manufacturer's specifications, but certainly not the demands of the users, which require a high write rate.
The map was made in China, for Germany granted a SanDisk 10-jähreige warranty.

My conclusion: I'm going to use the card in the smartphone and hope you is granted a long life.