Judging a fridge filter on its own leads nowhere, because the honest question is whether it is the best way for your household to get better drinking water. Set against the three obvious alternatives it wins on one measure comfortably and loses on the others, and which of those matters depends on how much water you actually drink.
Against a pitcher
The fridge cartridge wins on convenience by a distance: no filling, no waiting, and it treats the ice as well. Capacity is comparable or better, and the water is chilled either way. The pitcher's advantages are that it costs almost nothing to start, it works in a rented kitchen with no appliance, and cartridges are widely available. For a household choosing between them, the fridge filter is the better daily experience if the appliance already has the capability.
Against a tap mounted filter
Roughly even, with different compromises. A tap filter treats water at the kitchen sink where cooking happens, which a fridge filter does not, and it is often certified for a wider set of claims. The fridge filter handles ice and needs no thread on the spout, which matters because many taps have none. Running costs are similar. Households frequently end up with both, which is reasonable, though it is worth checking that neither is quietly years past its interval.
Against an under sink system
Here the fridge cartridge is outclassed on every measure except installation. An under sink carbon block holds far more media, so cost per volume treated is much lower and intervals are much longer, and a reverse osmosis system addresses contaminants no fridge cartridge is certified for. For a household that drinks a lot of water, or that has a laboratory finding, the under sink route is the better answer, and the fridge can then be fed from it rather than filtering separately.
Where the fridge filter is genuinely the right choice
A household on a monitored municipal supply whose complaint is taste, who values ice quality, and who does not want to alter any plumbing. That is a large group of people and for them the cartridge is a fair match between the product and the problem. The caveats are to change it on rated volume rather than the indicator light, and to check what the specific model is certified for rather than assuming. Our replacement filter guide covers matching cartridges.
Questions people ask about are fridge water filters good
Is a fridge filter better than a pitcher?
For daily convenience yes, and it treats the ice as well. A pitcher costs less to start and works in any kitchen.
Is it better than a tap mounted filter?
Roughly even. The tap filter treats water where cooking happens; the fridge filter handles ice and needs no aerator thread.
How does it compare with an under sink system?
Outclassed on cost per volume, interval and certification. The fridge can be fed from an under sink system instead.
When is the fridge cartridge the right answer?
On a monitored municipal supply where the complaint is taste, ice quality matters, and nobody wants to alter the plumbing.