Product review (4 stars): Works fine for us.
I've used their filters for the last 3 years on our SubZero (once I saw how expensive the official ones are).  I recall reviews a couple of years ago being more positive but the recent ones seem mixed.  Our experience has been fine so far so I would recommend them.
Our SubZero only makes ice so we don't have any feedback on how it does with drinking water.  That being said, the ice tastes fine to us.

The filters are smaller than the subzero.  The diameter of the filter is smaller so you should expect that.  Here is a tip.  After you replace the filter, empty out all your ice and let it run for a night or even a day.  The 1st batch of ice can come out black or gray.  I'm assuming its the charcoal dust as water is going through the filter the first time.  Maybe we are doing it incorrectly?  Even if the ice looks fine, throw it away as it could contain small particles that you only see after the ice melts.  After a day or so, its fine and you are set for another year.