I am setting up a 120, there were no controllers the last time I had an aquarium. I settled, after much debate on the Apex El. I do not want to buy a second hand controller which is out of business. I do not want to buy a Neptune classic or junior as the savings are not enough to justify a compatibility issue even with the current clearance. The EL also has integrated wifi which makes access a little easier if you have a home network (previous jr and lite did not). I chose the El over the standard as I really do not expect to run ozone and that seemed to be the only advantage. As far as how it works, I cannot tell you as I have not hooked it up yet. I expect it to work well. I also had a long debate about the Tunze ato vs apex atk, went with the tunze as BRS just put them on sale for 20 dollars cheaper. The APEX was more integrated and has access for some water alarms and extra sensors. I thought this would be worth it for the same money in spite of reports of more difficulty with setup and troublesome programming. Then someone dropped the price and the simpler option looked more attractive. Hope this helps.