We had an awesome time. What a great trip and views. Entertaining trip with a great pilot. We had 5 passengers in the helicopter and there was a good amount of space in there. There were 7 spots available and with two more people it might get a little tight and claustrophobic.
They offer a drop in the canyon floor and also a deeper run to the top. beware however of the toll stop at skywalk... it's pretty expensive but still very cool. It really bothers me that they don't allow camera's or phones and hide behind potential broken glass as the rationale.
The Guapo point is really a great outpost to hike around and take pictures. HINT: Don't get too close to the edge.