Product review (4 stars): Filters great, fits good but a slight design difference
I received the product quickly and packaging was good but when I initially tried to install it I encountered some resistance so I thought I got the wrong filters.  After some investigation I figured out that there was resistance due to the water pressure on the system, so it was my fault.  That being said, during my search for reasons why there was resistance, I found that the opening at top of the filter is small and square while the filter I was replacing was larger and round.  Given that it did fit, and didn't leak, the only difference I have found is that the smaller square opening in the filter restricts the water flow, so it takes a few seconds longer to fill up a glass of water.  Not a deal breaker so I'd buy them again.