The interview was detailed quite clearly. While the whole process took quite some time (I think about 3 months) I at least got my results rather quickly.
The different questions are rather hard, and indeed prepare for the questions a lot. Know exactly what you want to do.. having a clear vision of what you want is most important. But also research into the company.
In the end I stranded after the video interview, and while I understand that they get a lot of replies I was slightly annoyed that there was no feedback on how or why you get rejected at any point during the interview process.