Product review (5 stars): Change filter based on usage - not by an arbitrary timer
When the little red LED lights in your fridge, it either means the filter's full, OR the six month timer since the last filter install has passed.  If the water's still flowing freely and tastes good, I just reset the timer.  I always write the date of either a reset or a filter replacement in pencil near the LED.  A single filter will last us about a year of light usage.

Bottom line, if you use your filtered water infrequently, changing filters based on a six-month timer is a waste of money - specially at the cost of these filters.  If, on the other hand, you run several gallons a week for a large family, the filter may start to inhibit flow and need replacement more frequently.

But anyway, as filters go, this OEM unit works as designed.