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I just got the 128GB version for $98 from B&H, yesterday. So I haven't had time to mess with it. Thinking I may use it for my backup.
 
128G for $94.29 on Amazon today. I got lots of ebooks and Coursera videos to put on it.
Might try Virtual Box VM files too, but not expecting much. Maybe I could "park" rarely used ones there and copy them to the SSD when needed.
 
how will the speed differ if an itunes library is stored on an sd card? is it slow??

I did a test on the 128GB model, and it was 45 mb/s write, and 90 mb/s read. Not bad. Should handle a iTunes library just fine.
 
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