I have and highly reccommend a defNder. It is adjustable so I can move from my FV to my ITA car easily, just adjust the angle. Also, it is easy to get out with, you just have to make sure to flip the belts off, or pull the tabs and twist your head while buckled in to leave the DefNder behind, then hop out. People getting stuck in cars is mostly from not practicing getting out. If you practice getting out of your car quickly just a few times, you'll be able to get out in a hurry when it really matters.

Steven