They're also slower - 8gb is class 4, 4gb isn't even rated (class 2?)
You can find transcend class 6s at about the same price (a bit less actually), at least for 4gb
http://www.amazon.com/Transcend-TS4G...0052521&sr=1-2
I got two of those, one in a mogul, one in a touch, both no issues at all