Here's the reply from NWD:
"1. I don't know why our z-wave motor is expensive than US. But our z-wave motor is very good.
2. No , we don't use Dooya's switch, we make switch by ourself.
3. Yes ,we have Dooya's motor tracks.
Sorry , i don't where can buy Dooya's products in Europe.
Thanks"
Not that helpful...