The criticism often expressed, the door opening is too small, or web between input and output is too long, I can not agree. That the Mitwettbewerbers Catmate model has a significantly longer ridge. After installation in a conventional door remains no projection of the ridge. However, our cats have a normal size (4 to 4.5 kg of body weight). If a cat does not fit through this door, you should make a serious thought about a diet for the cat thought.
Cats cat flaps are accustomed to, learn how to use after the first sniff of the new flap immediately. The only problem is the clicking when unlocking the door. Here, our cat has always scared at first. But after two days she has gone through to make even without maintenance.
Now I only hope that manufacturers also soon bring a flap on the market, where you can also cats refuse outlet. From time to time we would quite like to leave even a "cat-patient" in the house. Sorry, none of the current models from other manufacturers do. One can only block the outlet for all cats, they can just clean only by the flap.
To praise yet the fact remains that you can operate the door even without batteries and without programming than ordinary cat flap. Then there is a small knob at your disposal with which you can for example, block access or output or both for this case. This button you can still get to use, for example, time to lock the door for a night completely or if the cat at night to get even after the activation and use in battery mode. Then you have not cumbersome change the programming.