Summary: I'll admit I mostly bought it because it was called "FireFly." I would have also purchased it if it was named "Serenity." That said, it's a good little thumb drive, although it would be extremely easy to lose if you aren't especially careful. It is very small and the cover isn't attached to the drive, which can also be a problem. Other than that, it's fine as a bit of extra memory.
Summary: I've had my FireFly for two years now. I'd had a Sandisk flash drive that somehow deleted all of its files, so I was looking for a Mac compatible flash drive. My boss recommended this one. Several months ago, I accidentally washed it. After it dried, I tried it and it still worked and none of my files were missing or corrupted. A few days ago, it fell out of my new pants pocket. I looked everywhere and found it in the driveway this morning.