Pros : If you already have glass tiles on sheets you may find the sheets made on this smaller than those. I got these to make accent areas of tile. I will have to make the sheets already made over again with the grid to make them the same size. But these tiles fit perfect in the grid if I take them off the paper and re do them. The difference is simply the grout lines. These grids make a smaller grout line, and would rather have a smaller grout line. So what may be a CON to some is a PRO to me. I like the grids, and they are cheaper than some I have seen. The others may be the ones that the grout lines that come out larger too.