I've been using these laces now for about a month.  I wanted to wait a while to give a review because, for me, this is an entirely new way of lacing up my running shoes.  In short they have been perfect.  They allow you to find just the right level of tension and then lock that setting in.  I find with standard laces that I'm always readjusting them as the shoe or the lace itself stretches.  With the iBungee laces you don't have to worry about that because they flex with your foot.  it is also possible to slip the shoe on and off without ever releasing the clamp that holds the laces in place.

In short, it makes my running shoe easier to put on and take off while also making them more comfortable to run it.  The "maintenance" is also reduced because I don't need to readjust my laces nearly as often.  Highly recommended.