I'm not involved in the machine vision field but I found his commitment to open and transparent academic publishing very admirable.
He published a paper with their summer intern here: https://arxiv.org/pdf/1608.01230.pdf
He published a paper with their summer intern here: https://arxiv.org/pdf/1608.01230.pdf
On the other hand, the arxiv is also the default method of communication in quite a few fields (physics and maths, mostly), to the point that while grant committees etc. look at your peer-reviewed papers, I essentially only check the arxiv for new developments, not the plethora of properly peer-reviewed journals.