Gearhead Mania
SanDisk Ultra Class 10 micro SDHC card (16GB, 32GB, and 64GB)I purchased the 32GB card for my Samsung Galaxy S3 and the 16GB card for another video recording device. I formatted both cards in FAT32 using Windows 7, and functioned without drama in the respective devices. I purchased the 64GB for my GoPro Hero3 Silver edition.The reason I chose the SanDisk Ultra is for the Class 10 speed rating, as well as the waterproof, shockproof, vibration proof, and X-ray proof durability. I had the 32GB Sandisk fail after 2 months of easy usage in my Samsung Galaxy S3. I don't abuse my phone and it is not subject to extreme temperature/vibrations. Sandisk replaced it under warranty but it was quite a hassle to do this.The 16GB card however, has been subject to extreme temperatures for well over 4 months: from -5F to 100F and that doesn't include solar loading from sitting under the sun, as well as 100% humidity! The 16GB card was dripping with water after I experienced water intrusion in one of my cameras, and it had been soaked in water (while operating) for several months.The packaging was easy to open by simply cutting across the top. However, finagling out the blister pack took some patience. The Frustration Free packaging is essentially a cardboard envelope sleeve with a plastic holder and the SD card adapter with microSD card inside. This is how it is shipped!Overall: 4/5 stars. Very affordable and decently fast micro SD cards. These are perfect for smartphones or recording devices used in extreme environments. However, one of them failed within 2 months. The speeds are also inconsistent. I posted a benchmark photo on Amazon showing my speeds with all 3 sizes of cards and the 32GB was the fastest.UPDATE 28 OCT 2012My 32GB card has failed after just over 2 months of use in my Samsung Galaxy S3 phone. It started dismounting/remounting intermittently by itself over night. I woke up this morning to find that the card is not readable via the phone and wouldn't work on my PC. The phone has not been abused and was not used in an extreme environment. This card was replaced under warranty by Sandisk.