I use these when cutting sheet stock.  The Board Buddies not only hold the stock down against the table, they draw the stock to the rip fence.  They help out a lot, especially in a one person shop.  Also, just a note, I don't use these when cutting anything narrower than 6-8 inches, where I'd use a push stick.  I saw a video of someone pushing a 2" piece part way through and then going to the out-feed side and finishing the cut from the back of the saw.  I thought that was silly.