Craig A
I purchased this to put into my Samsung Galaxy Blaze, mainly to store music.  I previously owned an Adata 32GB card which died after a couple weeks.The most annoying thing about large storage is copying files to it, especially when the card is slow.  A class 4 would take well over 2 hours to fill up, while this one takes just a bit over 45 minutes.Using the Antutu benchmark suite, this card clocked in at 11.1MB/s write and 21.7MB/s read.I didn't have to format it or anything, just popped it out of the packaging and threw it right into the sd slot of my phone.