It's one of the absolute must-haves for Android. I use it on a phone (no tablets for me).
Ideal for transferring files from network shares to your Android device. Also a great device for navigating your files in general - my Windows usage is mostly centered around Explorer; ES File Explorer is the Android equivalent. This should be part of Android, not a separate app.
For tablets to really take off in the corporate space, they need to be able to easily access resources on the network like desktops and laptops do. I run this on my tablet and can then pull up spreadsheets, docs, etc from the network without having to transfer them via cable or dropbox.
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