Automation is great... when it works... and when it is still within the rather loose margins of error for a standard hobby test kit.
There is a cost associated with this convince.
Looking at my history, I have maintained a 0.18 DKH deviation in my tank over the last 7 days.
The ALK low was 8.1 and high was 8.28 with an average of 8.21 over the last 7 days. My target DKH is set to 8.2. I consider this extremely stable and thus good for the tank overall.
I could not do this without automation.
How much does this play into the success of the tank? I don't know. Does this matter? I don't know. Does this extreme 0.18 deviation frustrate me? Absolutely, to no end. One day I will get it dialed in.