This insert does a great job and it's easier and faster than making one out of wood.  I use this on my DeWalt DW745 Compact Tablesaw.  Even though it isn't specifically made for this model of saw, a little time on my belt sander and it fits good (there are some nubs on the sides and ends that needed to be sanded down).  Also there is a recess on the bottom so you don't need a smaller 8 inch blade to cut the slot in the top.