I made the stupid mistake of not reading the Tripadvisor reviews of this tour and instead relied on the good advice of a "Tours and Tickets" salesman.
Most of the tour was wasted at the mandatory "Diamond Factory" stop and much of the commentary on the remainder of the tour involved attempts at selling tickets to other attractions. I didn't end up learning much about Amsterdam at all.
I strongly advise you to do your research in advance (I trust you are doing this now) and avoid, avoid, avoid.
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