I rather agree with Nudge. I use 0.4 with an earlier version of rern's UIe, which has addons disabled to prevent any updates. The buttons will never be big enough for me, and I think the circular progress bar is rather a waste of space, but the facility to remove all the features I do not use from the UI, including the volume control, make it the best of all players.
I am hoping that with v0.6 Rune will return to being a more purist player, with optional addons.