"Has anyone ever had any negative feedback?"
Patrick Sometimes someone will write in saying they did not get faster. We then review how to do the exercises with them to make sure they are doing them properly. Sometimes that helps.
Usually people who have negative feedback have never really tried the program properly themselves or don't understand it.
They may have the idea that the program is to help them get stronger and they think there are better ways to get stronger - which is understandable;
O r else they may teach other methods to get faster and don't want to introduce new techniques that would change what they have been teaching all along - that is to be expected.
Or they may have had some success getting faster using other methods and it makes them feel good to think they have the answers - that can happen too.