Yes, this place is definitely expensive but you're paying for the view. It's probably the nicest…read morebeach restaurant around this area, and I biked to many of them! The service is pretty slow but they are happy to let you sit as long as you like. I especially appreciated that when I told them about my dietary restrictions, they offered me a menu listing ALL allergens in the dishes! This was super helpful, and I felt that they were happy to accommodate.
The chips/fries came with a whole tube of local Dutch mayonnaise. Also, when I asked for ketchup for my chips/fries, it was the first time in the Netherlands that I got more ketchup than I needed - and this made me really happy.
The fresh mint tea was nice, and came with the requisite speculoos biscuit cookie.
I'd say come by for a nice atmosphere and the ocean-facing view, but it's probably a one-time thing for visiting if you're in the area with friends. Nice for drinks and hanging out in the sun (if you're lucky enough to have sun in the Netherlands).