While the tiles themselves are good, and the price reasonable, the set comes with 6 edge borders and 6 corner borders. In order to put a border on a 4 x 6 area (24 tiles) you need 16 edge borders and 4 corner borders. The border pieces provided, therefore, are essentially worthless. You're better off getting a box knife and just trimming the puzzle edges off your finished mat (or leaving it with a puzzle-piece edge). For that I can only give these three stars.