Has anyone tried charging via USB C from anything other than the Apple charger that came in the box? I want to pick up an extra charger, but wanted to see if anyone has tried anything else yet. I was thinking of buying a $12.99 USB - USB C cable, plugging it into an iPad charging block, and then seeing if it will even charge. I get that it would be slower, but if we are talking about 3 hours for a full charge vs 1.5 (per Apple charger), then I'm not concerned. Anyone try different combo's here yet?