It's cool... as long as you don't like your seat tilted back too much.

 

I've taken a 36 hour straight trip (Cleveland to Oklahoma back to Cleveland) to pick up a car with a friend. Everything went well, but bring a small pillow to put behind your lower back for lumbar support. 48 sleepless hours, 36 of which driving the S. I also brought a toolbox with half of my tool collection in it, jack/jackstands, fluids, and an OBDII scanner/code manual all just in case.