Just got a Remora Pro several weeks ago. I went with the Mag. My reasoning was twofold - the Mag's have a great reputation compared to possible problems with the Rio and there were a number of recommendations to do so.
The only thing I don't like much is the drain fitting on the cup. I'm going to have to come up with a quick disconnect for the 5/8" drain hose to facilitate emptying/cleaning the cup.
Chris