Obviously you haven't met very many Dutch people
Generally speaking, you can expect a lot of practicality from a Dutch fatigue clinic (I didn't go to blatant a SOLK clinic), but not a lot in the way of friendliness. My experience was the Dutch clinics are pretty bad, because they are privately run to make money. The fee is paid before treatment, for 6-18 months of treatment at the one I went to, and they go to some lengths to deceive their desired customers before they sign up, such as by claiming to use the CCC for diagnosis (they don't).
When it was obvious that I would have no improvement to report, due to deteriorating enough that I had to cancel my further appointments, they responded by un-diagnosing me with ME and replacing it with a diagnosis of obesity, presumably so that I wouldn't muck up their claimed success rate. They also were doing some research there, which I had agreed to participate in, though I think it only involved a sleep study.