I received the product in blister packaging and not "bulk", which gives the guarantee of origin. I measured the write speed (the one that counts) to 20MB / s on average, which is half the speed of Samsung 64GB SDXC cards for this seller. It's not the card to put in a Gopro but in a smartphone or tablet this card will be fast enough to play HD video. The adapter is convenient, especially if your laptop has an SD card slot.
