Horrible! Complicated!! Came with more size bands than I needed and so I could not figure out which band to put in which spots to get a good fit! Do I skip a row in the middle? What size am I suppose to start with? There were around 8 bands (smallest to largest) and his shoes only needed 5! (I don't remember how many they give bc I threw them away). After placeing them in and then needed to take out and try a different size band multiple times, they were mangled. First time I attempted, I put a few in and they made his shoes too big, then I pulled those out, tried again, and the bands made his shoes too small!  They are are soooo hard to put in and to take out! I am very patient, methodical, and someone who finishes things, but this was outrageously frustrating, painful, (think of tying off 7 balloons/hole), and a waste of time!