I've looked at those and I like the concept. I don't have the headroom in my reg cab but it would be nice in the double cab behind my head.
I like that the rifles would be out of the way and more secure inside the vehicle.
I do like the case I have because it is very easy to store 2 precision rifles and all the misc. hardware in one easy package that is dust and water proof. I always know where my ammo, cleaning kit, targets, hearing protection, and lens cleaner are.
This is a doskocil gun guard. It is extremely durable.