My hardware volume control is now working beautifully thanks to Janui's fix at
hardware-volume-control-not-working-t1204-10.html#p26013The only other slight problem that I have noticed so far is that the volume + and - buttons below the rotary slider (which is smooth, a delight to use), sometimes do not respond at all, and otherwise are unpredictable, increasing or decreasing the volume by what seem to be random amounts, either 1, 2 or 3 + or - respectfully.
This is by no means a deal-breaker, in general 0.5b seems to work very well, sound lovely (except when my wife listens to crooners!
), And is definitely, to my mind, preferable to volumio, which I have used as a backup system for a few days.