Plenty of people have asked this question: (Do Toning Shoes Help?; My Advice on Toning Shoes; Should I bother getting toning shoes?; Given that a lot of the toning shoes are being sued for false advertising, are these shoes still worth using?) and the answer to the question, 'Do toning shoes work' is not as clear cut as many would like to believe.
Certainly, the companies making these shoes have faced their share of litigation from regulatory authorities and disgruntled customers (Why the Toning Shoe Marketers Got Busted; ‘Exercise Shoes’ and Legal Action). Most of this action results from the health claims made for the shoes versus the actual evidence that they work or not. If you make health claims for any product, there does need to be some good evidence to back up the claims.
At the end of the day, there is some evidence that they do work and there is also some evidence that they do not work. It does appear that the response to these shoes is very specific to the individual. Some people respond to them and some people do not respond to them. Each individual is going to have to determine if the shoes are for them or not.