Product review (3 stars): Well Priced Filter, Not 6 month lifespan.
(Update: Dec 3 - Though the package of the filter states it will last 6 months or 750 gallons, we noticed considerable slow down of filtration after about 5 weeks and the replace filter notice came on after about 75 days.  And we drink a lot of water, but not 9 gallons a day worth to hit the 750 guarantee. Had to knock off a star for this reason and will wait to see about the 90 day guarantee to retest the filter.)

Purchased this for our Whirpool refrigerator, it was a bit less expensive than other models (Home Depot sells a generic 2-pack for around $45). So far, so good. It has been in for a week and the water quality is excellent. The fridge has a monitor that states when it needs to be replaced. The generic HD ones lasted about 5 months (we drink a lot of water) though 6 months was expected life expectancy. Will update this review when it is time to replace to note how long it lasted.

5 stars: Meets or exceeds all stated parameters, is of good quality and value.
4 stars: Mostly meets all standards, but lacks in one or two minor areas.
3 stars: Good, but can use improvement or is over-priced for similar products.
2 stars: Did not meet expectations, needs improvement. Inferior to similar products.
1 star: Returned product if of poor quality and manufacturer was unresponsive to finding a solution.

I hope to break down all review in a Pro/Con manner and explain and faults or issues. Thanks for viewing.