Just for balance, I’m not a fan of my (very expensive) kinetico 2020c.
In principle its great, and when it works it a joy of ease of use.
But it fails all the time. It gets to a point, about once a month, when it just refuses to regenerate itself. At that point I have to manually advance it to regenerate, then its good for another month or other random length of time. Strangely it happens more often if the washing machine is used, so I’m guessing it doesn’t like that flow rate or similar.
Its been serviced at least once with no joy, and all the (approved) installers seem to be able to suggest is to have it serviced again for another £100!
For the record, its about 7 years old, and has happened since installation.
Just my experience, YMMV.