i'm 6' tall and depending on how erect i sit, my head can come in contact with the headliner. what i noticed for the first time last night is that when my head is nearly touching the headliner i am looking ahead through the very top portion of the windshield and there is some distortion. enough that traffic lights appear double (one on top of the other) as well as the tail lights of other cars. not a big deal but it looks a little funky. i also noticed that during the day looking through the top couple inches of the windshield results in objects looking shorter than they really are. if my body is more relaxed i sit a little lower and don't see this. anyone else notice what i'm talking about, or care to give it a try?