In no way corresponds to MB / s promised

I had acquired this gift card (ordered from Amazon) and up to the tests of a 4K video with my GoPro Hero 4 black, the picture was quite choppy, I then tried to 1080p and 120 ips it was the same. In fact I can use a maximum of 1080p 48ips fashion so the picture is fluid ...
I went checked his writing ability on an application that has shown me that it was 16,45Mb / s! Tests well below the previous reviews (the proof is in the image attached to this comment).
Despite this incident I still request a replacement and not a refund since the site itself GoPro recommends this SD card for my GoPro Hero 4.

I remain nevertheless surprised at the absence of a prior control of their product before it goes on sale!