I agree with 05gtsilver, If someone is walking behind you at night, you will not see them. My previous car I even installed brighter back up bulbs, didnt help much. I would tend to back it in the driveway all the time. Easier to back in the drive because nothing changes, backing out can be a hazard with pedestrians and cars. Also would put down the side windows to get a better view if needed.
But boy will it look nice! I will be tinting the Mustang the same way once I get it.