[Perfectlap]

it's about an inch or inch and half lower than the lowest driving position. Maybe two inches. It definitely changes the viewing angle.
Out of curiosity once I had my friend's kid brother who is a little shorter than you put on my helmet and get in for a rough broom stick test. His head was still above the windshield by a good couple of inches.
You can install the Brey Krause bar to lower the seat a little more.