Flap not particularly stable.

Installation and programming were any problems, the function is as expected.
The flap itself is but just as unstable as with simple flaps that have previously kept only about a year.
Whether forms of frost on the inside condensation that then the brush can freeze solid, is not to be assessed after the last mild winter.
A flap which can only own cats by, is a highly recommended investment.
She now works for half a year, even with the first batteries.

Supplement: When the flap (door panel) would be insulated somewhat more stable and easily (eg double web plate against condensation) and two tumblers would, like the one-sided model the same manufacturer, I would forgive 4.5 points, timer 5 points.