It seems that your sister got an incredible deal for a good-looking and yet great-sounding instrument. BTW, a US dealer sells this for over $3,000.

https://www.youtube.com/watch?v=ry6oPt383NU

Medeli website shows many digital piano and keyboard models. Very interesting. I'm just about to buy a Roland FR4x. It's about $4,000 USD. I would think that Medeli could make one for less then $1,000. I won't worry about the quality of the sounds as I will use expanders like the Ketron SD40 along with VST plug-ins.