Cole, they work perfectly at different flow rates, they are also very precise. Mine operate at up to 20GPM, so I can do several stations at once. I think I can do 570 drip emitters at once if they are 3.2 GPH. Most of my friends use dosamatics, and have different feed lines to deliver CaNO3. I went with dosatron, because that's what our state agronomist told me to do, and they are what they use.
I can control ratios very easily, yes, but have mine set at 100-1 which makes it easy math to calibrate them.
I am in this for the long haul, and have not had good luck with cheap anything, I hate replacing stuff.
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