The ST is very quiet. They had to add the sound sympozer so you could hear the engine noise. The steering is very firm and great for mountain roads but still usable on the freeway. I haven't noticed the wind pushing me around. The amount the wind effects the car is a function of it's side profile. That's all corrected with wind tunnel testing these days.
On my drive home there is one spot where I bottom out in my Range Rover if I'm hauling in the ST I hear the sound of the gas strut compressing but no bottom out. I have also managed to jump the car a couple of times and the landing is smooth without bottom out. So I don't think your going to be jarred by potholes unless your going very slow.