Dave I purchased the RKL L3 I believe its called. It was my best investment to date. I had it running both of my lights (T5 and Moonlights), heater, cooling fans so they came on when the tank hit a certain temperature, my pumps for feeding time and my ATO.
Best thing I ever did. Also used there PH probe and Itemp probe. It was nice to have those reading at any time. Never got around to purchasing the Net module or the Salinity probe. I also thought it was very easy to program with the newest firmware. I say go for it you won't be disappointed!