Used the app today and noticed a few issues
1. distance to turn spoken is different from that shown.
2. rerouting did not work seamlessly in some instances it did not work at all.
3. Good long distance instructions but at times not enough warning close to junctions/roundabouts.
Now used the app in U.K. France and Belgium so I have trialled it reasonably extensively. Could do with more of the buttons/functions working and obviously as said before more English/French etc for non Dutch users. Hope this helps.