I use almost 75 ml (each part) of Randy's 2 (3) part daily, can see no reason to go with a Ca reactor.
Randy's 2 part works out to about $1 per month, along with a dosing pump if you want to automate dosing (+ / - ) $200, that's still a long way from the (+ / - ) $600 for a Ca reactor, + supplies for it, + low PH issues, etc, etc.
Randy's 2 part is nice in that you can "fine tune" the Alk part to either 1) raise your ph, 2) lower your ph, or 3) have no effect on your ph depending on how much / what ratio of baked vs unbaked baking soda you use.