Was installed by the port on my car. One side was a simply hook, the other a giant suit type coat hanger. I didn't want to pay, sales guy couldn't figure out how to get it out, so I got to take it home. It was actually easy to detach the hook pieces. Now there is the two inch thick base piece under the head rests. Haven't figured out how to get them out. The coat hanger was huge, the rest of it is pretty subtle. Seems sturdy, but haven't really used it.
@bluesun - I thought the coat hanger may be useful in winter but if huge takes off the classy look of the interior. Did it look odd with the coat hanger or you just took it off as no interest to use it?