I bought this item because I have a 32 GB phone, and I was CONSTANTLY running out of storage space. Maybe half of it was apps, and the other half was media (pictures, videos, audio, etc). When I saw this item on sale, I thought it was the perfect opportunity to try its convenience. I was not disappointed. Here's a little pro/con on this item:
Pro's: small (hence, portable), convenient, large capacity, sticks right in the phone to free up space, serves as another flash drive for the computer as well.
Con's: You need to download Sandisk's App to move your files from the phone to the drive, and this is the one thing that I didn't like: the app itself. Very restrictive, not as user friendly as you would expect and while transferring files, the battery of the phone drains like crazy; so large transfers (say over 5 GB) aren't an option unless you have your phone fully charged. If you can live with that (I can...) then this device is a good option. The transfer rate is quite reasonable, so that helps in saving some time. But absolutely a much more convenient way to free up some space in your phone than plugging it in to your computer or deleting apps. Sure, you'll eventually have to stick the drive in your computer to free up its space, but that's way easier than doing it with the phone, and also a lot less frequent.