Has anyone got a magnetic cat flap? Are they any good?
I used to...it's kind of ok, but the problems I found with it were:
Need to make sure cat is always wearing a collar...if cat loses a collar it can't get in - at least with a chip based system they always have their chip
The magnetic tag is quite cumbersome (although they seem to be a lot lighter these days)
They rely on the fact that other local cats don't have a magnetic tag...we had problems with another cat still coming in because it too had a magnetic tag
The sensor picks up the tag from both sides of the flap, which meant that my kitty would sit on the inside looking out, and the flap would operate because he was so close to it!
So really, it depends. Personally given the option I would rather go for a microchip cat flap these days