I bought this card as a memory upgrade for my HTC Desire. Initially the card worked, with quite a slow read speed, but it worked. After a couple of weeks I found accessing media on my phone quite glitchy, sometimes my photos wouldn't be there and apps that were stored on the card wouldn't open. Then my phone began crashing, and when rebooted the SD card was mounted as 'read only'. No amount of rebooting and reformatting helped. It is not a problem with my phone because there are no problems when I tried using my old 4gb card that came with the phone.
Maybe this card will be ok for other devices, but HTC or other android users be wary.
This little card works brilliantly... and its an awesome price..
I use it in my HTC Desire HD and have had no issues..
however I recently learnt about different Classes on Memory Cards.. this is a Class 4 which isn't the fastest.. I would recommend getting a Class 10 (which is the highest) as that is the best for HD recording.. and its super fast for data transferring And it will actually speed up your phone!!
hope that helps
I took a risk and purchased this card just after to Christmas to see if I could use it for ReadyBoost under Windows 7.
I popped the card into the micro SD card adapter and into the laptop, formatted the card in Windows as ex-FAT and I was able to use all of the card's capacity to ReadyBoost.
I would recommend this card.