Before purchasing this I had a SanDisk 16GB Class 2 microSDHC. Needless to say, I didn't see the need in purchasing one of these. Then I began to read how Class 10 cards really do process recordings faster and records pictures faster. I didn't believe it, so I put it to the test. Using it in my Samsung Galaxy sIII, I installed it and recorded videos, took pictures, and played music on it. I also downloaded PDFs for work and other documents to it. In every test, it was far faster than any other class, and you can tell a difference between the classes. To close, I would just say don't settle for a lower class because it's cheaper. Wait for these to go on sale (because you know as well as I do that they will) and purchase one then. There is no reason to get a card in a lower class.