Did it 2 times already.
Belgian here and I usually do the same if I'm pressed for time, their service is excellent and the money is on my bankaccount the same day, because I have the same bank as them.
If I have enough time, I usually go with Kraken because their fees are way lower.
Bitonic does charge a lot of fees and they've also raised their minimum withdraw quite a bit, was at 500 euros at one point in time even, now it's 'just' at 100 euros.
Do they accept customers who are neither Dutch or Belgician? Since fees are higher than others like Kraken, which are their competitive advantages?