I'm more concerned about these becoming launched during an accident, ie front or rear and them getting launched at our kids heads. Not many have been crash tested and a kg metal tablet at headheight isn't the best thing. Could make a relatively minor accident turn into something more nasty. I planned to get something that was put into my other car but ended up getting a roof mounted screen which was better again. That has got a heap of use and once that car becomes my wifes will definitely be wanting something in the new car, but not keen to get things messed with the car. The seat rail mounts would be secure but are down too low.