I have tried various elastic laces over the years and have now made the obvious choice to go with lock laces.  I have converted all of my tie shoes to this system and have changed all of my wife's sneakers as well.  They also have LONG 72" laces for my hiking boots - and they work great.
Love how easy it is to tighten or loosen my shoes.  Looking over my order history, I now own a dozen sets!  I am very happy with these.