Product review (1 stars): Multiple failures
I'd had the old version of this filter (the PUR 4396841) in my fridge for almost a year and a half.  I'd wanted to replace it after around a year, but Amazon stopped selling that one and this "new" version was ridiculously priced, so I held off until either the old one failed or the price of this one came down to a reasonable level.  A little over a month ago, it finally fell below my price threshold, so I pulled the trigger.

After installation, I ran through 3-4 gallons.  The water flow was a little slower than advertised (and about 30% slower than the flow without any filter installed at all).  It was still fast enough, though, and was probably about equal to the old one I'd been using.  Unfortunately, 2-3 days later, the water flow became severely restricted and the fridge would make groaning noises as it struggled to deliver any water at all.  I'd press the button to eject the filter and run the water with no filter in place.  It ran fine.  I push the filter back in.  Runs for a couple seconds and then it stops the flow again and makes that horrible groaning noise.  I fought with it for another hour or so, getting periods of decent water flow followed by total failure.  It appeared to be a lost cause, so I contacted Amazon for a replacement.  I get the replacement, install it, run it through its paces... and then pray that this one works.  it does ... for 3 days.  The same issue arises, except this time the water flow is eventually completely cut off.  Awful... just awful.  I've since filed with Amazon to return this one for a refund.  No way am I wasting my time on a third one.  I've since reinstalled the old filter I had before I bought this version, and it's been running fine.

I do not recommend these.  I wish Amazon still sold the old PUR 4396841.  To their credit, though, Amazon has been fantastic about the replacement/returns.  They overnighted the replacement at no cost to me.  I filed for the replacement in the afternoon and received it the following morning.  Incredible service there and completely headache free.. which is why I went ahead and tried this new version of the filter.  This filter gets zero stars if I could give it that, but Amazon gets 5 for their service.