I have the Profilux Plus II controller and the Dosing Pump module (not stand alone since I have the controller) and love 'em. Makes life much easier and they're very accurate. Unfortunately I DO NOT recommend them for ATO... the pumps are not meant to be constantly used like that. I've had mine for just under a year (3 pump model), and I'm going to have to replace the pump I've been using for ATO in the Dosing Module as it's obviously wearing down. I'll be using a small Maxi-Jet hooked into my controller for ATO down the road... it stinks as one of the main reasons I bought the Dosing Pumps was for the easy ATO, but what can ya do!? I use the Balling Method, so I still have use for them