I'm a hair over 6'3" and 195lbs. Very comfy in the gen2, 3, and now 4. I've driven the gen4 car more than 10 hrs in a day and had no issues with comfort. On my gen3 I did do a 1" lowering kit and that made it lux comfy. I got in the gen5 and drove it with similar ease without lowering the seat. The clearance issue I find in the cars is with a helmet on the track, the left side roof line above the window, I tend to bounce the helmet against that area once a lap. I noticed in the gen5 that it seemed to be the same. But I didn't play with seat height so that could make a difference.