My wife, two adult sons and I took the half day Milan tour, despite some previous bad reviews. This tour group seems to get good reviews for their longer (full-day and out-of-Milan) tours, but I now agree with the less than favorable reviews for the half-day Milan tour.
It was one of the worst tours I have purchased - and I have purchased lots of city tours. A consistent complaint in some other reviews concerned the head-sets you wear, to hear the guide while touring outside the bus. Despite carefully testing them in the bus, several participants could not hear our guide while touring outside of the bus.
Also, the guides English was not optimal. She spoke quickly, with a somewhat heavy accent, and used incorrect words in her descriptions, making comprehension difficult.
Finally, (and I have never witnessed this before) she managed to lose 6 participants while touring - first at the Victor Emmanuel Galleria and Duomo square and then at Sforza Castle. At the Galleria, we assume it was because of headset failure and at the Sforza Castle it was because she said she would be going in one direction (after telling clients they could take 10 minutes to use the restrooms) and then going a completely other direction! The two customers she lost at the Castle, thus missed the Last Supper portion of the tour.
The missing customers caused us to sit in the bus for well over a total of 45 minutes, while the guide when hunting (unsuccessfully) for the missing people.
I would recommend you take note of this and other poor reviews of the half-day Milan tour and seriously consider using another guide service.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC