I booked this with another cruiser so do not know the name of the tour person - but she was very unprepared for our group. Our main purpose was to be in Oia for the sunset. We were there but never got to see the sunset since she did not reserve a viewing place or dinner for the group. It really was a very disorganized tour.
If you do not have elite status or boarding passes that let you off early, good luck. All the reflection tours folks get to leave first and there are plenty of them, herding into buses like cattle.