I have never done a Tauck tour, but my grandparents always did and loved the tours they took. While in Copenhagen, Doug and I were in a museum where we had the good luck to overhear a Tauck tour lecture. It was superb.
Doug and I asked the tour how they got the lecturer and they told us they were part of a Tauck tour. We asked how satisfied they were and they said that all the lecturers were as excellent as the one we just heard. It was fantastic and we were very, very impressed with the quality, both delivery and content.