The last 5 years I have been via AMS at least 40 times a year and up to 140 times in a year. Was not always so bad, but the last two years have been horrible.
I got the privium card via FLUX and it is near useless. I get access to the iris scanner and it recognizes me, but as the FLUX website (but not the documents I got from CBP) states, US Passport holders will ALWAYS get kicked to the immigration desk because EU law requires that we get a stamp. I then have to show my Privium card and have them look over my poassport six ways to Sunday beofre getting a stamp (to be fair, 80% of the time it is like this. The rest of the time it is fairly quick). Funny part is that I have to pay more than the regular Privium members who get to walk through without getting stamped. I have paid a significant sum, just to get to the front of the line. Not really what I was led to believe. At the end of they year, I will be dropping this junk.