About 3-4 months ago, manual dosing really started to become a chore. Aside from the labor of doing it, if I was gone for a day, my params dropped and I would have to recalculate dosages and test several times to get things back inline. I know this wasn't optimum for my corals, so I began shopping for a doser. After hours of reading...I decided to go with the Profilux Stand-Alone unit. I am very happy with it. The quality appears to be exceptional and setup was almost too easy. I've not had a single problem.
GHL/Profilux appears to be a top notch brand and I was not able to find one negative review for any of their products. It makes me want to purchase one of their controller systems to replace my Apex!