We have it. I messed around with it. Good price point and definitely a Korg sonic signature. IF you like Korg voicings you will like the PA-50. As a live machine it's better then the PSR700. But style support is rather thin.
It has a better build quality in my opinion then the the M50 which feels like a toy in build quality. But has the Triton Sound set. That's a good thing. Seems Yamaha and Korg Keyboard makers are releasing their predecessors in the M50 and MO series.