unfortunately I have to chime in here. I bought 2GB card for my trip to Miami and when I first used it it showed only half capacity and was slow as hell to copy to (which is what clued me into something being wrong).

I had to put it in my digital camera to format since my Mac refused to do anything with it. the camera formated it with the proper capacity.

By chance I checked the memory usage on my tablet and the thing is showing 64% full even though there's far less than a gig of data on there.

I haven't had any data loss or anything like that but this isn't good at all.