Cat flap recommendations

[Purplekitchen]

Can anyone recommend a good catflap that works by microchip recognition?
It's for an ordinary wooden door.
We have a new cat who is very active in and out all day and it's getting a bit chilly to leave the door ajar.

Sure flap get reviews.

We've got a sure cat. The first set of batteries have gone flat fairly quickly (3 months), but they were fairly old (I think PiL brought them, along with 44 other AA battries about 4 years ago - does that affect lifespan?).
Apart from that, it has worked well. And neighbours ginger cat is no longer found in the kitchen!

I've looked at on line reviews and Sureflap seems to be a favourite.