Product review (3 stars): Locked up after only 1 month (updated)
I'd had good luck with these for the last few years up until the one I got at the beginning of November.  After less than a month of normal use (3-5 pints a day), it locked up my water flow.  When I remove the filter, the water runs just fine.  So I stick the filter back in, and it starts to run fine again.  Then it locks up after another couple of days.  I've done this process 4-5 times now and the time it takes to lock up again has decreased to less than a day now.  I've ordered a replacement from Amazon, which was easy enough to do (and they gave me a return label to print so I don't have to pay return shipping, which is nice and is what should be expected from every retailer when it's a defective product).  If I remember, I'll update this review after I give the new filter a little while to see how it performs.

Update (12-18):  The replacement filter was a failure from the beginning.  The filter's box (not the shipping box) looked like a savage beast had torn it open already (although the filter itself looked fine).  It didn't work any better, though.  I couldn't even get past flushing 2 gallons through it because it was taking too long.  It took over a minute to fill up a 16oz glass; imagine how long it would take for a gallon jug.  That's crazy and unacceptable considering it takes 5-10 seconds with no filter.  So I replaced that one as well.  Amazon stepped up and gave me free one-day shipping.  Filter #3, while the box looked brand new, suffered the exact same fate as the previous two.  Clearly, the manufacturer has changed something with this model.  I contacted Amazon to refund me for this filter and then I purchased a different model:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Whirlpool-4396841-PUR-Push-Button-Side-by-Side-Refrigerator-Water-Filter/dp/B000UW2DTE/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Whirlpool 4396841 PUR Push Button Side-by-Side Refrigerator Water Filter</a>.  Amazon also gave me a free upgrade to one-day shipping on this one as well.  It's been about a week and a half and, so far, it's worked like it's supposed to.  Yeah, it's been a bit of a headache, but the new filter was actually a few dollars cheaper and Amazon's customer service has been nothing short of stellar.  If you've ordered this filter and the water flow has severely decreased, you might consider giving the linked one above a shot.