Just a quick update, received a Samsung USB OTG Cable today
I had read that my Arcam rPAC was a but heavy on the juice and I had seen no reports of it working, however plugged into my UK Note 3....... it bloody works. Sounds very good, slightly less power than when connected to my PC, but that is to be expected. Works natively without UARP so I am very happy indeed, as I feel the rPAC is a very under represented piece of kit. Can it be added to the compatible DAC list please. Now I am off for some more listening and sending the E07K back to Amazon.
funnily, I picked one up today for £135 and was going to post the same :)
Does NOT work on HTC One though...
[Edit - Stock firmware]