Use for years Transcend products and have never been disappointed. So far not a single failure, the price-performance ratio is also fair. I bought extra for the Pana GH4 These U3 SDXC card, and I have to say that it is really extremely fast. Shots with 200 Mbit / s are no problem for them, and with a suitable card reader transfer rates of 100 MB / s can be achieved. A good U3 memory card just cost a fortune. I am very pleased.