i used to use those homedepot timers, never had a problem with them. I just bought a coralife aqualight timer yesterday, it was super easy to setup for dawn/dusk and moonlights. So only time will tell if it holds up for me. Heres a link to all the different models coralife has
http://www.aquatichouse.com/Maintena...r%20Center.asp
you can get these locally at Aquarqium Enthusiasts, Big Al's, Etc