SanDisk brands are my favorite, never had any problems. They're guanteed. I am a power user, in photography, on my cellphone and to me "external storage" is important. I need a product that will not fail on me. The SanDisk Ultra lets you transfer large files at great speed. It does make a big difference, and to top it all, the price is phenomenally great. 5 stars in my book. Thank you.