I use an Aquamedic Kalkstirrer and a auto topoff pump. I don't have a Ca Reactor for the same reasons you started this thread. I want to do the whole dosing pump method with my own chemical supplements.
You could leave them to automatically dose and up your params as needed. Including trace, strontium and iodine. Then have a week holiday-come home and everything is as you left it. I know cuz I stress when I'm not in front of my tank and go away for just a weekend, let alone a week. I just like the idea of adjusting params rather than relying on a reactor. But everyone is different, some will say Ca Reactor all the way and others, dosing pumps.
I'm also gonna add a fuge to help stabilize my PH. I recently went from a 14KH with 500Ca, it dropped over 2 weeks after I stopped doing my daily KH dosing. Now its at 7KH and 360Ca.
The battle starts again.