I use ReefFlo in my aquaculture. Not the Gold 5200, but one of the other models. Plus, I’ve sold them for years. Never had a complaint. Very reliable and low energy users.
I love my reeflo hammerhead it run my whole system with no problem. There quiet with low energy consumption. You can also dial them back without harming the pump
Good Pump, sub par customer service IMHO, If I had it to do over I would pay more money for a Dolphin pump, but overall I still think they are the best bang for the buck.