Product review (1 stars): The filter will not snap into the fridge
I bought this a year ago to have it on hand when my current PUR filter wore out. The old filter is losing its flow, so I tried to put this one in. It will not snap into place. I pushed very hard on it, and it simply will not snap in. To make sure I was doing it right, I put the old filter back in, and that one snapped right in, no problem. The new white filter looks the same as the old blue filter with some minor differences that were pointed out by other reviewers. It looks like those minor differences are keeping this filter from working properly.

I called the Whirlpool help line, and after 15 minutes on hold I finally connected to a customer support agent, who talked me through the installation procedure. It was the same procedure I was already doing, so I was not doing it incorrectly before. The filter would not snap in. He thought that it might be the wrong filter, but I have triple checked everything. I have the correct filter model for my fridge.

The service agent thought that there might be something wrong with this filter since I did not buy it from Whirlpool. He told me to order one from them and it will fit. I placed the order, but I have not received it yet, so I cannot report on whether or not a filter from Whirlpool (actually, Every Drop) will fit better than the one sold by Amazon. I will update this if/when I receive the new filter and try it out.

BTW, the new filter cannot be returned to Whirlpool for a refund if I open the packaging. Without opening the packaging, I will not be able to tell if the new filter will snap in to place or not. So there really is no return policy.  I am gambling my own 50 bucks on their hunch that the same filter from Whirlpool will fit while this one will not.

The bottom line on this is that this filter does not fit in the Maytag MSD2559XEM refrigerator. Caveat.

UPDATE:
I ordered a filter directly from Whirlpool as recommended by their help line. The cost was $49.99 plus sales tax. I received the filter in about a week.

The packaging of both the Whirlpool filter and the Amazon filter are identical, and the part numbers on the packaging, EDR3RXD1, are identical. The filters themselves are NOT identical. When placed side by side, you can see that on the Amazon filter, the body of the filter flares out as it goes into the end cap. On the filter from Whirlpool, the body flares out only a tiny bit, and meets the end cap mostly at a 90 degree angle. Other than that, they look identical. But that small difference seems to be key. The old blue PUR filter also does not flare out where the body goes into the end cap.

The first time I tried to put the Whirlpool filter into the fridge, it did not snap in. However, I gave it one more try and replaced the old one to see exactly how much force is needed to get it to snap in. Even with the old filter, I had to give it one last nudge in order to get it to snap in, so I tried that on the Whirlpool filter, and it worked. So, the Whirlpool filter DOES fit, and the Amazon filter DOES NOT fit. I did not try to remove the new filter to see if it will come out. That would be tempting fate a bit too much.

The bottom line is that there are at least two versions of this filter out there. One fits and the other does not, even though they carry the same part number. Caveat Emptor when buying third party filters.

I ran water through the filter until it stopped spitting air (about two gallons). The water smells and tastes OK. I cannot detect any of the off odors or tastes that other reviewers have reported. The flow is fine. It will take a while to see how long the filter lasts.

I am leaving this rating at one star because I am reviewing the filter that I bought from Amazon, not the filter that I bought from Whirlpool. They claim to be the same filter, but they are not. Because of the misrepresentation of the Amazon filter, I would remove my one star and give it a zero if I could. Caveat Emptor.