Review on SanDisk Extreme 64GB MicroSDXC Flash Memory Card - 90MB/s (SDSQXNE-064G-AN6MA) by Jim Cox

Doesn't record "smooth" video on GoPro in 4K. twitching and jumping. Additional Notes: I ordered what I was told from GoPro support and also worked with them to properly "format" the chip. They had no idea why it wouldn't work because the one I bought at the general store worked fine. I'm wondering if this is really an OEM device or a fake. If it really is a SanDisk device - it says it's 4K, it says Extreme PLUS, it has a 3 in a U. So it has to be right. I read that people bought it for a very important purpose, as did I. I used it to take pictures of terminally ill cancer children driving in race cars and couldn't get the video to work. Due to the poor quality of SanDisk, some of these "kids" and their families will never see their child smile for the last time.