Considering ATO

[Money pit]

My first was a JBJ, my second is a Tunze. I like the Tunze better, but I would recommend either depending on your budget.

[Aquattro]

I've plumbed my RO through a solenoid and float valve with a pressure shutoff. Works great. No hauling jugs, filling reservoirs, etc. My solenoid also fails in off position. Even if my float valve fails, the timer for the solenoid matches the evaporation rate. Best thing I've ever done in the hobby!