A comfy ride as long as you don't try and corner too quickly. Allowing the driver's body weight to swing as a pendulum towards the outside wheel, (and rise) is not the best for weight distribution going through a corner. If you really need to keep the driver comfortably vertical it would be best to lower that longitudinal axis to below his bum and keep him vertical with a computer-controlled stepper motor.
They found out along time ago that for best cornering you need to keep riders low and towards the
inside wheels. Here they use muscle power to get movable weight in the best position for cornering.