I am still using the Alkatronic and very much like it. I have not totally put it to full use and completely narrowed down my Alk range. Currently I have a low tolerance of 8.5dkh and a high tolerance of 9.2dkh, so ALK drifts within that range depending on my water changes and dosing.
In the graph below you will see ALK was at the high rang on August 7th. I turned off the Alk dosing via my Apex, intending to only turn it off for a couple hours.......well I forgot I turned it off until later that day and you can see the Alk drop from 9.2 down to 8.5.
The Alktronic is currently doing exectly what I want it to do at this point, prevent a drop below 8dkh and spike above 10dkh.
I eventually plan to narrow the range to 8.5 to 8.8.