Wife and daughter were my passengers.
They like the bike a lot and maybe for that reason they have found seat is comfortable.
BUT is also dangerous cause there aren't any handles or bikes-tail to keep the passengers steady.
My daughter had injured when, at 25/9, she fall down in a "smooth" acceleration in B-mode 3rd gear...
Last Sunday in a ride from house to Cape Sounion, in STD-mode, when i accelerate 5th gear, at 200-205km in odometer, i felt my wifes butt took-off the seat 2 times !!
Maybe this happened from the air-flow at high speeds.
When i asked her "what happened?" she told me that the first time an air wave pulled her up and then she couldh't sit down allthough she tried hard.
This happened in hard acceleration after 180km, when i open the throtle and the bike gained massive speed.... she was lucky cause she is experienced in long whellies and grabbed me hard and keep to stay on bike.
But my daughter which is unexperienced had hit knees, elbows, palms, shoulders etc....
So... beware and take care !