Product review (5 stars): so good. The filter leaked a little immediately after installation
So far, so good. The filter leaked a little immediately after installation, but that has ceased. The WSS-1 filter I was using before also leaked initially.

It would be nice if the label had marks to indicate the proper orientation for installation and rotation, but this isn't too hard to figure out on your own and use a sharpie to add them.

WRT how well the filter actually purifies the water, I really don't care. We drink unfiltered tap water all the time, so this filter is simply being used because the fridge wouldn't work properly without it.