Product review (4 stars): .20 cents per gallon and a flow rate well short of the advertised .78 - But water does taste good :)
1st Pic is the Whirlpool  - 2nd pic is the PURE

The Not So Fantastic

-This product is rated for 200 gallons NOT 300 gallons as stated in the Amazon description.
-Costs .20 cents to filter 1 gallon..some may find this excessive ( I do )  - $40 per filter as advertised 200 gallon rate.  We are paying for convenience as the filter replacement process is 1 2 3... There are much cheaper alternatives if you wanted to partake in some plumbing work and filter the water prior to the frig
-I have noticed a slight reduction in water pressure.  Nothing major.  The exact statistics follow
-This product does not have a flow rate of .78 gpm.  My calculated flow rate was .55 gpm.  I filled a 16 oz container in 13.8 seconds.
-This product actually reduced my frig water pressure.  The prior filter in use was a MORE Pure Filter rated at .5 gpm. This filter dispensed a flow rate of .61 (measured at end of lifespan so I suspect the flow rate was even better months ago) and filled a 16 oz container in 12.5 seconds.

PLEASE NOTE - Filter flow rates will vary greatly when the frig line is connected to a saddle valve.  If you are bothered by your low flow rate from your frig and you have a saddle valve it does not matter which filter you get.. your flow rate will suffer..!!! Get ride of that saddle valve

The Shame On Me
-Shame on me for ever taking an Amazon description seriously.  The description below the title specifically states this Whirlpool filter is rated at 300 gallons.  However, upon further review the official Whirlpool description states 200 gallons.  If the Whirlpool description was not displayed on this product page I would have deducted another star for sure.  However, shame on Amazon or who ever is responsible for their shoddy descriptions below the product title.  It does cause everyone, including myself, an big inconvenience when you want to make a quick purchase and are always doubting if the specs and or descriptions are accurate

The Not Too Shabby
-The filter claims to filter 23 contaminants and is NSF 42 and 53 certified.  The only reason why I was so suspect of this was Whirlpool claims the filters flow rate is better than its competitors that do not filter as well.  In my opinion this makes NO SENSE as higher quality filters filter out more contaminants therefor will be more restrictive.  Since this filter actually reduced my pressure I wasn't bothered by it.  B/c of this slight reduction I am more confident that this filter does indeed filter out more contaminants that my previous More PURE filter.
-The water tastes good.  I have not not noticed a taste improvement vs the old filter (More PURE filter) but thats not a bad thing.  This filter apparently filters out more impurities than the PURE but who's to say those impurities even have any sort of taste :)

The Final Verdict
My reason for a 1 star deduction was a combination of high price, incorrect description (200/300) and the filter not holding up to the advertised .78 gpm**  The way my family uses water I suspect I will use 3 filters per year which will cost $10 per month.  B/c of this price I will surely find cheaper alternatives (filter the water prior to the frig) once these filters expire.  But with this said, I am content with this product as it is a very convenient way to filter your water for drinking use.  I do wish the pressure was a little better than it is but with improved filtration usually comes more restriction so I've accepted this trade off.
If you value convenience I would recommend this filter.  If you value the dollar and consider yourself handy I would not recommend this product.

** - Please note my frig water dispenser is not connected to a saddle valve.  This 1/4" line is directly tapped off a 3/4" with a 1/4 turn shut off valve.