When I click the "learn more" button, it takes me to the smart matches table listing 18,728 matches, but doesn't show the one I click on. When I click on "view all matches from this family tree online" it takes me to the same place. I've never been able to see the smart match that I get in the email, and I've been using this site for about 15 months. I end up just ignoring those emails, because while they look interesting, they don't do me any good. I also have tried going into My Family Tree Builder, and looking for the person who it says has a new smart match, and I don't see any match.
Smart Matches allow you to search other trees that may have distant or not so distant relatives that you may not have prior knowledge of.
This summer I used it to match my great-great grandfather's family through his wife 's family. Sometimes it will be the completion of a puzzle of where someone fits into a family or tying up loose ends when putting together Family Trees.
Of course you have the option of not using it- your choice and many times they are not matches in your family. My family background is from Sweden and they use the father's name and use it as the son's surname which complicates finding family.
Give it a try and see if you find a new link in your family.