I have been using the Neptune systems ecosystem since the aquacontroller III. Over the past 20 years the systems have become much more intuitive and easier to program.
They have also moved more towards proprietary modules. With a Neptune systems Apex, you can still use any pumps, but if you are not using one of their pumps, the control can be more challenging to complete. And with Neptune no longer carrying their own pumps, they want you to move to a sister company. The ecotech pumps, then for integrated control you will need to purchase an additional module or be limited to the 0-10v controlling.
I've been using it so long I couldn't tell you how I'd do it without one at this point. I will say this, there are things that must be done for a hyper controlled environment.
Regular checking of pumps. my system does a daily 4 g water exchange, so I must insure both pumps are functioning properly. I do this via visual inspection occasionally. Along with the other additive pumps.
Double checking test results. I usually do this when testing solutions are refilled.
General equipment inspection. I'm doing this from time to time on any equipment however. Just adds a few things to check.
Programming double checks. I have a few reservoirs that have an optical sensor. Purpose is to stop any dosing pumps in the occurrence of an empty reservoir. From time to time I will simply pull out the optical sensor which will open the switch to make sure the pumps go to stand by waiting for the reservoir to be refilled. I do this every 6 months or so.
Again, I am so dependent on the system that I literally have a entire Apex system in a drawer in case a piece fails. This isn't something that is necessary and I did not have this for a long time. But for me if a piece fails and I need to send it to them for repair I can simply pull a piece out of a drawer, replace it. And keep going as normal. I even have a second Trident as I have become pretty dependent on that as well.
The major advantage for me is I can go away for 10 days with piece of mind. This also reduces my daily maintenance to more of a weekly maintenance. Sure, I do a few things in the evenings after dinner, but I'm usually only tinkering around for about a half an hour or so. I have a very large system.
I hope that helps.