Product review (5 stars): The more the cheaper. Works as expected.
First, if you own a fridge that uses these, check when the Replace Filter light comes on and pay attention to it. The water flow is much slower and the water less filtered once the filter is due for replacement.

Switching out the old filter is easy, the new one installs just as easily, and then it's just worth spending some boring minutes running water through the filter until it's ready for primetime coffeemaking, drinking, or whatever works for you.