I was using mine in a GoPro Hero 3.  The card just broke for no reason.  There is controversy weather its the GoPro or SanDisk, but after doing some Google research it seems that its more of SanDisk's fault as these SD cards also fail (or used to) in varies Samsung devices (phones / tablets).  Amazon sent me a replacement, so no harm done, but for the money you would expect something top notch.GoPro users (on the support forums) recommend getting 2x32GB SD cards, which have not had any issues as far as anyone knows.  The worst part is losing important content, I was lucky, I copied my movies from the SD card onto a HD on my PC.  Others not so lucky.