Product review (3 stars): Third times a charm...
I read a lot of these reviews, and was very worried when purchasing this. I needed to replace my filter, and the old blue PUR ones were too expensive - and not being made anymore. I read all the horror stories (metal taste, plastic taste, water wouldn't stop coming out, flooding, stopped working after two weeks) but I decided to take the chance anyway. This is supposed to be the official Whirlpool filter, not some aftermarket filter. I need this filter to work, since its supposedly better and definitely cheaper than the blue PUR ones.

First one didn't work at all, I inserted it and the refrigerator would not push water through it. Amazon took it back.

Second one, same thing - refrigerator would not push water through it - the relay would just click when I tried getting water.

Third one finally worked, pushed it in and it was fine. Water tastes perfect, flow is just as it was before. I have not had it two weeks yet, but I don't think its going to stop working.

I read a few reviews that say that the units that still said PUR on the box were old and defective, however all three of the ones I got said PUR on the side as a small logo - and the third one worked. I do not have a fancy water test kit, however I will say that the old blue filters did still have a little taste of chlorine. This one does not. I made ice with the new filter, let the ice melt, and the melted ice water seems perfect (not cloudy).

If the advertising is correct, and this filter does work better, then I hope Whirlpool gets their act together and makes sure these all work the first time. I'm looking forward to buying another in 6 months and not having this issue.

tl;dr - had to get three of these, first two didn't work (no flow at all). Water works and tastes great with the third one.