Don't worry about head-room on big bumps. If its a big enough bump you make you move out of your seat, worry about your tires and rims!

5' 11" No real problem. If I sit straight straight with the seat as high as it goes my hair brushes the liner, but that's not how I drive.

It is a cozy interior, meant for good-posture and attentive driving. Not to slouching, or stretching out. It does take some getting use to, but its very comfortable. No aches or pains or even stiffness from 14 hours straight, followed by 10 hours two days later, then another 10 the following night.

I can't even say that about the 70's Cadi's and they were like driving on the living room couch.