I got a Gnarbox a while ago and (generally speaking) I don't love it. It does a very adequate job of transferring files from memory cards to removable drives, but unless the editor has improved substantially in the last few revisions, it's a big headache. With a lot of my files I tried about 6 months ago, the Gnarbox would need to transcode to "create optimized media" which would take a while, given the Atom processor.
Although relatively recently, Luma Fusion announced some sort of Gnarbox integration so it might be worth revisiting the viability of the Gnarbox again, this time using a decent mobile editor.
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