Product review (4 stars): works, but you must purchase on faith
One's first purchase of a product that has multiple part numbers is daunting.  Fortunately, my appliance store helped me through it.  Indeed, each of the multiple brands owned by Westinghouse (I think that's the parent company's name) has their own part number.  And, while it's good that they are standardizing on filters, it's still darn confusing to place the order.
When it arrived, it looked quite different from the old filter I removed from our new fridge.
Then, it took some muscle (and faith that the pressure I was exerting wasn't going to break something) to properly seat the new one.
So far, all's well.  The flow of water is back to strong.
Too early to draw a bottom line.  We'll have to wait to see how long this one lasts, does it come out easily, etc.