I used a calcium reactor every day for over 6 years without issue. Once you figure out how it works and get it dialed in, it is a very stable piece of equipment which will give you great results.
I use a dosing pump now on a small system (90G) and it is not nearly as reliable as a calcium reactor.
That being said, dosing pumps can be effective, look at Darryl V's tank.
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I'm out. 
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