any experience with cat door mounted on a screen door?

Nasty wind tore up my storm door on my patio. It was silly to even have a storm door when this is a completely covered screened porch. Anyway, I want to get a new screen door, but I want to put a cat door on it so that the cats aren't bugging me to go in and out (they go out onto another porch....not to roam the property.)

So my question to people is, anybody here use one of those cat doors that fit right onto the screen? I'm looking at http://www.petdoors.com/pet_doors_for_screens.htm

I'm not looking to spend $200 on a door already manufactured with a pet door.

Any experience with any of these models?