My kids are always very impressed at cars that have built-in screens, especially when they are in the back seat, so I jumped at the chance to try these out.
Of course, you can also use them out of the car too. The package contains everything you need to get set up, including two sets of headphones which are good quality in their own right.
They are easy to set up, and as long as you still have DVDs, or films on any of the other mediums like USB sticks etc, they will work fine. My kids especially liked that they could watch different films at the same time.
Overall, it is a bit of an old-fashioned idea, and my children did go back to their phones quite quickly after watching a film on a long journey, but they have enjoyed using them.