I cannot praise or recommend this product highly enough. It really does the job of not just keeping your fridge smelling fresh, but of REMOVING odours. I bought a secondhand fridge a couple of years ago and it smelled strongly of onions. I left tubs of bicarb of soda in it but after several weeks, the smell still lingered as strongly as ever. Within a few days of placing the Fridge-It inside, the smell completely vanished. My fridge is tiny, but this takes up such little room that you hardly know it's there.
It would environmentally friendlier if you could buy replacement carbon linings, as the outer casing is made in 2 halves you could save on plastic wastage by refillling it. That aside, the product still deserves its 5 stars.