Product review (4 stars): Just under a month
I've had this installed for just under a month. So far so good.
It does what it said it would do, seals the opening with two covers.
I did notice an slight issue with the inner cover. It worked fine before I installed it and then once I installed it it didn't close right. Turns out I somehow twisted down the hinge for the cover. I pushed it back in to position and it has stayed there ever since. It's plastic so I'm wondering if it will stay during the hot summer.