I am really happy with intermatic products. I personally think they make some durable products. Check out the hardwired photo eyes on the site. Its worth a look. Good Luck, Brian
I think most Intermatics are warrantied for 5 years.
I deal with photocontrol all the time, and on a rare occasion you will just get a bad cell. Make sure you're using the proper unit rated for the load and also the TYPE of fixture (ballasted or unballasted)you are operating.