AMAZING!!!
I have attached this to the two fixed long leads of my Labrador, and now with the darker weather, it's perfect for spotting and cleaning up poo in the dark. The little lamp gives off plenty of light and can easily be recharged with USB.
A small tip: before you go for a walk, put a loose bag that's already a bit open in your pocket, because those poo bags are a real nightmare to open when you've got a lead in your hands!