Pros: The door works very well.
Cons: May increase chances of your cat becoming lost?
There have been studies that show that a magnet may disrupt your cat's homing instinct.
I would recommend the non-magnetic variety of door based on this possibility.
We have a magnetic door such as this and it worked great until our cat has recently turned up missing. Of course we have no idea if it has anything to do with the magnet causing him not to be able to find his way home. But why take the chance? Wish I had know about this possibility before purchasing the door.