Numbered Beanbags

What is it with boys and throwing things?  I know my boys would love a set of these Number Beanbags to toss around- I can only imagine the games that they'll invent.  Thanks to Lemon Tree Creations for a great tutorial on how to make your own set (plus check out that cute bucket and tag).  I did notice one reader left a comment suggesting to sew around the numbers to prevent them from falling off.  Anyone else ever used the iron-on transfer paper?  Does it hold up well??