Review on Silicon Power MicroSDXC Class10 SP064GBSTXBU1V20SP by David Gill

That's what it says. You get very good Class 10 performance at an affordable price. PNY offers a competing device with read speeds of up to 90MB without an adapter, and it cost about $6 more when I bought the Silicon Power device. I chose Silicon Power over the similar PNY and was not disappointed with my use as secondary storage in my tablet's MicroSD expansion slot. I've never bought anything other than SanDisk, but after a few setbacks and warranty support, I decided to try something different. Silicon Power offers a lifetime warranty, and while SanDisk honors its lifetime warranty, the SP comes at a better price and performs better than the SanDisk Ultra range.