Already have some SD cards of QUMOX in use. Therefore, again resorted to the brand, has namely a very good price / performance ratio and top quality and speed to.
Now I have my entire music collection on it moved and introduced this now in the car in the SD card slot (Blaupunkt Stockholm 230 DAB). Everything with this, full music enjoyment.
Would buy again.
Never had problems with malfunctions in this brand.