My opinion/experience with Maxspect Gyres and CoralVue.
I purchased 5 of these pumps (with three separate controllers).
Every single pump has had issues with clogging (sometimes within days of being given an acid bath)
Two of the controllers have lost power to one of the two pumps they are supposed to control. Even if you contact them within warranty, they will not help you with an ongoing issue the persists beyond the warranty period and expect you to pay for shipping, etc. etc.
The bushings they supply are very low grade and VERY QUICKLY build up and clog. This then causes the rubber boots to wear down because the bushings just spin inside the rubber boots. This effectively makes it so that the rubber boots are the new "bushings", and you can imagine how fast they wear down.
The customer service at this place (CoralVue is their umbrella company name) is absolutely trash.
There are very few companies that I flat out refuse to every buy anything from every again in my life, but this is CLEARLY one of them.
I have already wasted countless hours cleaning, replacing, fixing, etc these pumps, so please don't ask me to waste any more of my life posting pictures. I have looked at these gyres from all aspects (mechanically, chemically, and many other possibilities) that I could think of, and the only conclusion is that THEY ARE TRASH!!! DO NOT GIVE THIS COMPANY YOUR MONEY!!!