I've been to their research studies three times now, although for different cars.
Definitely legit, although the last time the lady asking me the questions was retarded. I asked if the car we were going to be driving was stick shift or not, because I prefer to drive stick shift, and I was told it was automatic, and then she stopped and asked me if I knew how to drive automatic and whether she would be safe going out on the drive with me.
I almost asked for another survey taker, since the one they assigned to me was too stupid for me to comprehend >_<