I got a Wiim Pro Plus couple of weeks ago as possible replacement for my Yamaha RN-602 receiver in the TV room, feeding a spare NAD C268 power amp I have which I think will drive the KEF R3 speakers better (it certainly does when paired with my RME DAC).
It works fine but (in common with the Yamaha) it cannot play music from folders from my vortexbox over the house network. Both it and the Yamaha (MusicCast) can play music from the artist, genre, album etc selections on their respective apps but just won't produce anything if asked to play from folders. And this is hopeless for classical music where multiple artists are involved and there is no commonly accepted tagging schema.
I tried BubbleUPNP app on my phone as a controller - it solves this problem for the Wiim, but the Yamaha still will not play from folders, which is annoying.
However.... the sound from the Wiim with the NAD poweramp is not too good to be honest, kind of heavy & smoothed over, and something very odd in the bass where there is a sort of leading edge of "fartiness" to low bass notes. The NAD power amp, driven by the RME DAC I use in main system, is a superb power amp and I know its not the problem.
So the Yamaha has gone back in its place and the Wiim is in its box awaiting its fate.