Mike,
I have been using one for a few years now. The controller is a great addition to my 120, provides me with a ton of versatility. Also helps cleaning up under your tank from all of the timers and cords. No more changing or resetting timers. The best feature is when traveling you can see your tank parameters and see what is going on. This has been useful when I needed to make minor adjustments when I am out of town. Programming at first we a little difficult, but once you get it in your head it is easy. The customer service is unbelievable for the difficult programming questions. Would recommend it to anyone that is serious about reefing and protecting your investment.