My friends and I took the Golden Circle minibus tour on Nov 28, 2016. We loved the group size (small), and our tour guide, Johannes Logason, was wonderful. Kind, funny, friendly, knowledgeable, he made sure that we had an excellent tour. The tour takes you to the typical stops on the Golden Circle. We liked the good interaction with Johannes, given the size of the group, where you can get a more personalized attention.
My only disappointment was that the tour as described in the website included a stop at Efstidalur - Icelandic farm, and we were really looking forward to the ice cream. However, this stop is not offered during the winter months to make sure that there is still sunlight when visiting Thingvellir. I suggest that the website specifies what stops are excluded in the winter tours. I was so ready to have some ice cream made from milk of happy Icelandic cows!