I have read that the JBJ is a good ATO. I just got a RKL and love the controller, very easy to use and has alot of different uses. I will be adding a SL1 to mine for Ph, ATO, etc. I love the standby mode, to shut down pumps for feeding. Simple but nice feature. I would cost twice as much as a JBJ, but can do alot more then just ATO.