Yup I'd encountered Fiio in a review but a different model. There's a few of them about.
320kbps but iPhone so M4A or whatever Apple use. I used to use FLAC loads on the laptop but hated having an album in both formats and I was running out of space. 
Neither had I. It was something I came across whilst having a look for a replacement for the Denons on Amazon and I had a look up in head-fi which had positive reviews. Impulse purchase.