I've got the same one and it doesn't stop cats tailgating other cats. It was however hilarious during the 'training' phase watching the stupidest of our two barrel towards the flap and go crunching into it.

Did have a good idea for gamifying it though - a cat airlock with a camera, $5 a month, getting bored old ladies on Facebook to compare the cat in the airlock and making the decision to let it through or not...