To my ears it doesn't sound too bad for a cheap board, except that what detracts for me is that some of the notes/samples don't sound "proper piano quality" ie. produced 100% by hammer hitting string.
There seems to be an element of "plucking" in the sound sometimes which adds a (slight) tinny quality. It became noticeable in the second (slower/quieter) Baartmann piece.

Not that it would influence any decision I might make to buy it as if I did I'd use it as a controller for Ty2.
I'm currently undecided whether to go for it or wait & see if TY2 successor adds extra keys- or even switch to Motif.
Too many keyboards can lead to unused clutter aound the place

John