Other tours involved a long walk from a crowded parking lot to the overlook. This tour was for 8-9 people in one tour truck, and it also included a short drive to within 100 meters of the rim for the Horseshoe Bend overlook. Some of the other tours to the Upper or Lower Antelope Canyon, so I was told, involved several tour trucks, and crowds of 50-80 people or so. These were the key selling points for me.
We booked this tour to the Secret Antelope Canyon & Horseshoe Bend Overlook mainly because there are no crowds and the price was reasonable.