I was unhappy with this product. Sure it says it's Class 2 but I didn't really know what that meant. But all this stuff about being able to play your media off it doesn't match my experience at all.
"The card allows you to expand the memory of MP3 players and mobile phones, and enables you to carry more on your device. This means you can get the most out of your mobile phone or MP3 and utilise its added features like camera or music player. Take hours of high quality video and watch your movies on the go, up to 128 hours. Freely take photos knowing you have room for up to 20000 photos. Store your music library on the Micro SDHC card with room for up to 8,000 songs."
Now I learn that it's too slow to play music or video well on my HTC phone - it seems you need class 4 or 6 to do that properly. But what else would you need that much micro-storage for? I'm going to buy a 16GB class 6 device instead. This will gather dust in a draw I guess.