Product review (4 stars): Works great, advanced install
This thing is awesome - I never have to deal with a blown out water heater and cold shower anymore!  It automatically relights The pilot light when it blows out.  The installation was a bit advanced - had to buy a power cord and connectors to complete the install.  Positioning the end for a proper repeatable spark may take some dexterity depending on your water heater. Try YouTube for an installation video.  If you are not mechanically inclined consider hiring someone to install it.  Again - I am very happy with the working product (and so is my family - nice warm water even after wind storms).