Ya I have heard this and also one guy that was dosing a error happened with the dosing and instead of one ounce it tossed in a nice 20 oz and nuked his whole tank and 10,000 worth of live stalk down the drain. These are the things that worry me.
Also if you wont use it to 100% then its worthless paying 1000 bucks for it.
I think ill just stick to doing it my way to where I know what I put in and I know how much water goes in and out.
Also read one guy that did the water change he liked the idea of never having to do a water change come home to 70 gallons of water on his floor when the thing got a error and did not shut off.
The bucket over flooded. I guess like anything if your going to have a computer run your system then you better hope to god you don't get no error