actually my RWAK has 1.30 firmware which works fine for me.
album art? could not care less especially because AK screen is below average quality for this not to be compared to Cowon S9 or iTouch... so i actually prefer black screen without album art.
speed? with 2x32G cards my RWAK functions pretty well and i do not care for 64G card, rather i keep more 32G cards at hand.
else? do not know what would be the problem, start up time is slow but it's fine for me while swapping songs and browsing is good.
meanwhile i will upgrade only if AK people will introduce better battery meter, support of cue files and ... may be... gapless?
otherwise i do not care about firmware upgrade.