I'm using emcore r968 since a month ago and I haven't found any serious issues. The only thing is that the default action (Rockbox in my case) is not used. It always shows the initial menu (rockbox, disk mode, emcore console, tools). BTW, I'm using a custom rockbox build (which I haven't shared because it contains several WIP and personal patches) and disk mode is working fine.
10/6/14 at 1:26pm